Agriculture is the production of food, feed, fiber and other goods by the systematic growing/harvesting of plants, animals and other life forms. "Agriculture" may commonly refer to the study of the practice of agriculture (also, "agronomy" or "agricultural science").

Agriculture encompasses many subjects, including aquaculture, cultivation, animal husbandry, and horticulture. Each of these subjects can be further partitioned: for example, cultivation includes both organic farming and intensive farming, and animal husbandry includes ranching, herding, and intensive pig farming. Agricultural products include fodder, (starch, sugar, alcohols and resins), fibers (cotton, wool, hemp, silk and flax), fuels (methane from biomass, ethanol, biodiesel), cut flowers, ornamental and nursery plants, tropical fish and birds for the pet trade, and both legal and illegal drugs (biopharmaceuticals, tobacco, marijuana, opium, cocaine).