Organic foods are made according to certain production standards. The use of conventional non-organic pesticides, insecticides and herbicides is greatly restricted and avoided as a last resort. However, contrary to popular belief, certain non-organic fertilizers are still used. If livestock are involved, they must be reared without the routine use of antibiotics and without the use of growth hormones, and generally fed a healthy diet. In most countries, organic produce may not be genetically modified.

Organic food production is a heavily regulated industry, distinct from private gardening. Currently, the European Union, the United States, Canada, Japan and many other countries require producers to obtain special certification in order to market food as "organic" within their borders. Most certifications allow some chemicals and pesticides to be used, so consumers should be aware of the standards for qualifying as "organic" in their respective locales.

Historically, organic farms have been relatively small family-run farms — which is why organic food was once only available in small stores or farmers' markets. However, since the early 1990s organic food production has had growth rates of around 20% a year, far ahead of the rest of the food industry, in both developed and developing nations. As of April 2008, organic food accounts for 1-2% of food sales worldwide.

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In the United States, the National Organic Program (NOP) is the federal regulatory framework governing organic food. It was made law in October 2002, and is administered by the Department of Agriculture (USDA). The Organic Food Production Act of 1990 (7 U.S.C.A. § 6501-22) required that the USDA develop national standards for organic products. The regulations (7 C.F.R. Part 205) are enforced by the USDA through the National Organic Program under this act.

It covers in detail all aspects of food production, processing, delivery and retail sale. Under the NOP, farmers and food processors who wish to use the word "organic" in reference to their businesses and products, must be certified organic. Producers with annual sales not exceeding $5,000 US are exempted and do not require certification (however, they must still follow NOP standards, including keeping records and submitting to a production audit if requested, and cannot use the term certified organic). A USDA Organic seal identifies products with at least 95% organic ingredients.

There are currently 56 U.S. domestic certification agencies accredited by the USDA, including Organic Crop Improvement Association, CCOF, Quality Assurance International (QAI), and Indiana Certified Organic. There are also 41 accredited foreign agencies that offer organic certification services.

The NOP covers fresh and processed agricultural food products, including crops and livestock. It does not cover non-food products that may be sold as organic, including natural fibers (eg: organic cotton), and health and beauty products (eg: organic shampoo).

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