The English word coffee entered the language in 1582 from the Dutch koffie, which was borrowed from the Ottoman Turkish kahve, itself derived from the Arabic qahwah.¹⁴ Medieval Arab lexicographers associated qahwah with a term for a dark wine, tracing it to the verb qahiya ("to lack hunger"), in reference to the beverage's reputation as an appetite suppressant. Modern linguists also point to the Semitic root qhh, meaning "dark color," while alternative, disputed hypotheses link the word to the Arabic quwwa ("power") or to the medieval Kingdom of Kaffa in Ethiopia, where the plant grew wild. In Arabic and Ethiopian languages such as Amharic and Oromo, the plant and its raw berry are instead called bunn, buna, or būn.

While popular legend attributes the discovery of coffee's energizing properties to a ninth-century Ethiopian goatherd named Kaldi who observed his flock dancing after eating bright red berries, historical and genetic evidence indicates that Coffea arabica grew wild in the southwestern Ethiopian highlands, where local populations such as the Oromo consumed the crushed fruit mixed with fat. The earliest substantiated evidence of coffee beans being roasted and brewed into a hot drink dates to the early to mid-fifteenth century in the highlands of Yemen. Figures such as the Yemeni scholar Jamal-al-Din al-Dhabhani, who died in 1470, adopted the beverage, and Sufi orders used it to ward off fatigue during nocturnal prayers.¹⁵ By 1414, the plant was known in Mecca, and by the early sixteenth century, the beverage had spread through the Mamluk Sultanate in Cairo, Damascus, and Aleppo, reaching the Ottoman capital of Constantinople, where the first coffeehouses (qahveh khaneh) opened in 1554.¹⁶ Despite periodic religious bans in Mecca in 1511 and later in Cairo by authorities concerned about political gatherings in coffeehouses, coffee became entrenched in Islamic urban life.¹⁷

For two centuries, Yemen maintained a strict monopoly on world supply, exporting beans from the Red Sea port of Mocha (Al-Mukha) only after boiling or parching them to destroy their fertility.¹⁸ According to tradition, this monopoly was broken in the seventeenth century when an Indian Muslim pilgrim, Baba Budan, smuggled seven fertile seeds out of Arabia and planted them in the Chikmagalur hills of Karnataka, India. Dutch traders subsequently established coffee cultivation in their colony of Java in 1699 and in Suriname in 1718. Through Mediterranean trade via Venice, coffee entered Europe in the late sixteenth and early seventeenth centuries, with London's first coffeehouse opening in 1652.¹⁹ In the 1720s, the French naval officer Gabriel de Clieu transported a cutting from a coffee tree in Paris's royal botanical garden across the Atlantic to Martinique, from which cultivation spread across the Caribbean and Latin America. In 1727, Lieutenant Colonel Francisco de Mello Palheta introduced coffee seeds from French Guiana into Brazil, which expanded into the world's dominant producer during the nineteenth century through large-scale plantation agriculture reliant on enslaved African labor.

Coffee plants belong to the genus Coffea in the family Rubiaceae and grow naturally as evergreen shrubs or small trees capable of reaching heights of 9 to 12 meters (30 to 40 feet), though commercial farmers prune them short to facilitate harvesting. The plant produces clusters of fragrant white blossoms that develop into oval drupes known as coffee cherries, which turn bright red when ripe and typically contain two seeds—the coffee beans—encased in a protective inner parchment skin, sweet mucilage pulp, and thick outer skin. A single coffee tree yields only enough fruit each season to produce approximately 0.5 kilograms (1.1 pounds) of roasted coffee.

Commercial cultivation is dominated by two species. Coffea arabica, which evolved between 10,000 and 15,000 years ago as a natural hybrid of Coffea canephora and Coffea eugenioides near the border of Ethiopia and South Sudan, accounts for roughly 60 to 70 percent of global production.²⁰ Arabica thrives at higher elevations between 600 and 2,000 meters (2,000 and 6,600 feet), where cooler temperatures slow cherry maturation, allowing complex sugars, organic acids, and aromatic precursors to accumulate while maintaining a lower caffeine content of about 1 percent by dry weight. Coffea canephora, known commercially by its primary variety robusta and first documented in the Central African Congo Basin in the 1890s, makes up 20 to 40 percent of global output. Growing from sea level to 800 meters in warmer climates, robusta yields more fruit per tree and contains 1.7 to 4.0 percent caffeine (averaging 2.2 percent), which acts as a natural insecticide and imparts a harsher, more bitter flavor suited to espresso blends and instant coffee. A third species, Coffea liberica, native to West and Central Africa and cultivated mainly in the Philippines, Malaysia, and Indonesia, represents about 2 percent of global production.

Cultivation occurs within the tropical "Coffee Belt" between the Tropics of Cancer and Capricorn, spanning Latin America, East and Central Africa, and Southeast Asia. While up to 80 percent of the world's coffee farmers are smallholders managing plots of a few hectares, twentieth-century agronomy shifted many regions from traditional shade-grown polyculture under native forest canopies toward high-yield, sun-grown monoculture plantations.²¹²² Crops face severe biological pressures, most notably coffee leaf rust (Hemileia vastatrix), a fungal pathogen that defoliates trees and causes $1 billion to $2 billion in annual losses globally, and the coffee berry borer (Hypothenemus hampei), an insect pest whose larvae feed inside the developing seed.²³

Once ripe cherries are harvested, they must be processed promptly to remove the outer fruit layers and dry the seeds to a stable moisture level before milling and export as unroasted "green" coffee.²⁴ Three primary post-harvest processing methods are used worldwide, each altering the chemical precursors inside the bean. In the dry or natural process, the oldest method, whole cherries are spread in the sun for three to six weeks and raked regularly until dried, after which mechanical hullers strip away the dried fruit and parchment, yielding heavy-bodied, fruit-forward coffees. In the wet or washed process, machines depulp the outer skin and fruit within 24 hours of harvest; the mucilage-coated beans then undergo controlled microbial and enzymatic fermentation in tanks before being washed clean and dried, producing a cleaner, brighter acidity. The honey or pulped natural process serves as a hybrid in which the outer skin is removed but some or all of the sticky mucilage is left on the parchment during drying.

Brewing extracts water-soluble chemical compounds, emulsified oils, and suspended solids from roasted grounds. The rate and balance of extraction depend on grind size, water temperature, contact time, and agitation; finer grinds increase surface area and speed extraction, while water that is too hot or applied for too long over-extracts bitter compounds, and water that is too cool or brief results in sour, under-extracted coffee. Preparation methods are categorized by how water interacts with the coffee grounds.

In decoction and immersion methods, grounds remain in continuous contact with water.³² Turkish coffee, one of the oldest traditions, simmers powder-fine grounds with water (and optionally sugar) in a long-handled pot called a cezve over low heat to build foam before pouring the unfiltered liquid and suspended grounds directly into small demitasse cups. The French press (or plunger pot) steeps coarse, breadcrumb-sized grounds in water near 95 °C (203 °F) for roughly four minutes before a metal mesh plunger separates the grounds, leaving natural oils and fine sediment in the cup for a heavy mouthfeel. Cold brew immerses extra-coarse grounds in room-temperature or refrigerated water for 12 to 24 hours, extracting fewer acidic and bitter compounds to create a smooth concentrate.

Filtration or gravitational percolation methods pass hot water through a bed of medium grounds held in a paper, cloth, or metal cone, as in manual pour-over and automatic electric drip brewers, which retain coffee oils in the paper filter to yield a clean, crisp cup. Pressurized extraction forces hot water rapidly through tightly compacted, finely ground coffee. Espresso machines use high mechanical pressure to produce a concentrated, syrupy shot topped with a reddish-brown foam emulsion called crema, which serves as the base for milk drinks such as lattes, cappuccinos, and macchiatos, while stovetop moka pots and manual devices like the AeroPress use steam or hand pressure to achieve intermediate concentration.

Coffee is a major international commodity traded in standard 60-kilogram (132-pound) bags, with primary futures contracts traded in New York for arabica and London for robusta.³³ According to the International Coffee Organization (ICO), global production in the 2025/26 crop year rose 4.4 percent to 183.6 million bags against consumption of 180.6 million bags, generating a 3-million-bag market surplus after several consecutive years of supply deficits.³⁴ For the 2026/27 marketing year, the United States Department of Agriculture (USDA) Foreign Agricultural Service forecast world output to climb 6.0 percent (10.8 million bags) to a record 189.7 million bags, with global bean exports reaching 131.4 million bags.³⁵ Approximately 86.5 percent of international coffee shipments consist of unroasted green beans, 13.0 percent soluble (instant) coffee, and 0.5 percent roasted coffee.

Production is highly concentrated among a few nations. Brazil is the world's largest producer, with the USDA projecting a record 2026/27 harvest of 71.9 million bags (comprising both arabica and robusta, concentrated in states such as Minas Gerais and São Paulo) following recovery from prior droughts. Because Brazilian arabica trees follow a strong biennial bearing cycle, weather fluctuations in Minas Gerais are the primary driver of global price volatility; the ICO composite indicator price peaked at a nominal record of 343.08 US cents per pound between February and May 2025 before falling to an average of 248.90 cents per pound by June 2026 as supplies rebounded. Vietnam is the second-largest producer overall and the leading supplier of robusta, with 2026/27 output forecast at a record 32.5 million bags. Colombia ranks as the second-largest arabica producer (forecast at 12.5 to 13.4 million bags across 2025/26 and 2026/27), followed by major producers including Indonesia (11.0 million bags of robusta and 1.5 million bags of arabica in 2025/26), Ethiopia, Honduras (6.0 million bags), Uganda, and Peru (4.78 million bags).³⁶ The European Union and the United States are the largest importing markets, accounting for 46.2 million and 23.4 million bags of bean imports respectively in 2024/25, with 66 percent of US adults reporting daily coffee consumption in 2026.

Brewed coffee is a complex chemical matrix containing more than 1,000 bioactive and aromatic compounds.³⁷ Its primary psychoactive constituent is caffeine (1,3,7-trimethylxanthine), a purine alkaloid that crosses the blood-brain barrier and acts as a competitive antagonist at adenosine receptors (including A1 and A2A subtypes), blocking the drowsiness-inducing neurotransmitter adenosine and increasing alertness and psychomotor vigilance.³⁸³⁹ Beyond caffeine, coffee provides substantial dietary quantities of phenolic antioxidants—chiefly chlorogenic acids (esters of quinic and cinnamic acids)—alongside the niacin-derived alkaloid trigonelline, roasting-induced melanoidins, and the fat-soluble diterpenes cafestol and kahweol.

Prospective cohort studies and meta-analyses associate moderate habitual consumption of both caffeinated and decaffeinated coffee with reduced risks of all-cause mortality, type 2 diabetes mellitus, Parkinson's disease, liver cirrhosis, and several cancers, including hepatocellular (liver), colorectal, and endometrial cancers. Researchers attribute many of these metabolic and cytoprotective effects to polyphenols and melanoidins that activate antioxidant pathways such as the Nrf2 system rather than to caffeine alone.⁴⁰ However, caffeine intake equivalent to two to three cups can acutely elevate blood pressure and provoke insomnia, anxiety, palpitations, or acid reflux in sensitive individuals, and health authorities recommend limiting intake to one cup or less per day during pregnancy due to potential risks to fetal growth. Furthermore, the diterpenes cafestol and kahweol present in coffee oil potently raise serum total and low-density lipoprotein (LDL) cholesterol; unfiltered preparations such as Scandinavian boiled coffee, Turkish coffee, and French press deliver 6 to 12 milligrams of diterpenes per cup, whereas paper-filtered drip and instant coffees retain or lack these lipids, delivering only 0.2 to 0.6 milligrams per cup.⁴¹

The expansion of global coffee output—which grew by roughly 60 percent over three decades—carries significant environmental costs. Coffee cultivation is responsible for approximately 5 percent of global deforestation and ranks among the top six agricultural drivers of forest loss worldwide, with the top ten producing nations emitting an estimated 21 million metric tons of carbon dioxide in 2017 from coffee-linked land clearing.⁴² Across the full supply chain from fertilizer application to transport and roasting, producing one pound (0.45 kilograms) of roasted coffee generates roughly 11 pounds (5 kilograms) of carbon emissions, while the use of synthetic agrochemicals in sun-grown monocultures contributes to soil erosion and water pollution, and single-use disposal discards some 50 billion cups annually in the United States alone.⁴³

Simultaneously, anthropogenic climate change threatens the viability of coffee farming.⁴⁴ Rising temperatures are shifting optimal arabica growing zones upward in elevation by roughly 100 meters per decade and allowing both Hemileia vastatrix leaf rust and the coffee berry borer to breach former thermal ceilings above 1,000 to 1,800 meters in East Africa and Latin America.⁴⁵ Up to 60 percent of wild Coffea species face extinction from habitat loss and warming, prompting organizations such as World Coffee Research and Ethiopia's Jimma Agricultural Research Center (which maintains over 6,000 arabica germplasm accessions) to breed drought- and rust-resistant hybrids from wild Ethiopian forest populations. To curb forest destruction, producers and roasters have turned to shade-grown agroforestry, Fairtrade and organic certifications, and regulatory mandates such as the European Union Deforestation Regulation (EUDR), which requires verifiable geolocation proof that imported coffee does not originate from land deforested after December 31, 2020.⁴⁶