API, originally Advanced Programming Interface but now more commonly known by its near-synonym, Application programming interface, is any defined inter-program interface.

API or api may also refer to:

Companies and organizations:

• Academic Programs International, an American study-abroad provider
• Advanced Processing & Imaging, a software developer of enterprise content management (ECM) solutions
• American Petroleum Institute, an American trade organization
• AmeriStat Pharmaceuticals, Inc., a US-based international wholesaler and exporter of pharmaceuticals and medical supplies
• Animal Protection Institute, an American non-profit organization
• Anonima Petroli Italiana, an Italian petrol (gasoline) company
• Associated Producers Incorporated a B picture subsidiary of 20th Century Fox
• Athletes' Performance Institute, an American training facility for competitive athletes
• Australian Pharmaceutical Industries
• Australian Property Institute, an Australian trade organization
• Automated Processes, Inc., an American audio electronics company
• Automobile Products of India, an Indian automotive company
• Aviation Partners Inc., an American aviation components company

Education:

• Academic Performance Index, a measure of scholastic performance used in California, United States
• Auburn University, formerly known as Alabama Polytechnic Institute

Places:

• Api (mountain), Nepal
• Api Chamber, a large cave chamber in Malaysia
• Mount Api, Malaysia

Politics:

• Alliance for Italy, a centrist political party in Italy
• Arab Peace Initiative, a peace initiative first proposed in 2002 at the Beirut Summit of the Arab League

Science:

• Active pharmaceutical ingredient, a basic component of any medicine or pharmaceutical drug
• Petroleum industry nomenclature deriving from American Petroleum Institute;
  • API gravity, a measure of the density of petroleum.
  • API number, a unique identifier applied to each petroleum exploration or production well drilled in the United States.
  • API unit, a standard measure of natural gamma radiation measured in a borehole.
• Analytical Profile Index, a miniaturized panel of biochemical tests compiled for identification of groups of closely related bacteria

Other:

• Advance Passenger Information, passenger information collected by commercial transportation operations
• Air Pollution Index, a measure of air quality used in Hong Kong and Malaysia
• Armor-piercing incendiary, a type of armor-piercing shot and shell
• Asian-Pacific Islander
• Aviation Preflight Indoctrination, the first major phase of training for a United States Naval Aviator
• International Phonetic Alphabet, a system of phonetic notation; "API" refers to the French name for the system, Alphabet phon tique international

For information on Wikipedia APIs, see here.

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