API

(navigation) air-position indicator (computer science) application program interface

API

Application Program Interface

API

(Application Programming Interface) A language and message format used by an application program to communicate with the operating system or some other control program such as a database management system (DBMS) or communications protocol. APIs are implemented by writing function calls in the program, which provide the linkage to the required subroutine for execution. Thus, an API implies that a driver or program module is available in the computer to perform the operation or that software must be linked into the existing program to perform the tasks.

Plenty of API Programming Is Done
Understanding an API is a major part of what a programmer does. Except for writing the business logic that performs the actual data processing, all the rest of the programming is writing the code to communicate with the functions in the operating system and other system software.

The APIs for operating systems can be daunting, especially the calls to the user interface routines to display the menus, buttons and windows on the screen. There are more than a thousand API calls in a full-blown operating system such as Windows, Mac or Unix, and the APIs in one platform are very different from another platform. See IDE, function and interface.

APIs Become Obsolete
Operating system vendors are upgrading their capabilities all the time with new functions in the latest OS version. However, after many years, in order to streamline their software, they discontinue support for older functions, which means those APIs in an existing app no longer work when run in the newer version of the OS.

The only choice programmers have is to update their apps to communicate with the new routines (new APIs). In the case of business applications, an organization can put off installing a newer OS version, at least for a while. However, with commercial apps, developers have little choice but to update their programs because they do not control their users' environment. In the case of mobile apps, unless they update their code, developers will be unable to deploy the app to the online store.

API

Acronym	Definition
API➣Application Programming Interface
API➣Academic Performance Index
API➣Active Pharmaceutical Ingredient
API➣American Petroleum Institute
API➣Application Program Interface
API➣Ajax Paving Industries (various locations)
API➣Audio Products International (various locations)
API➣Application Interface (Department of State)
API➣Asian Pacific Islander (club)
API➣American Pacific Industries (Valencia, CA)
API➣Advanced Photonix, Inc. (various locations)
API➣Asian and Pacific Islander (US Census usage)
API➣Atmospheric Pressure Ionization
API➣Associated Press International
API➣A Positive Image (various organizations)
API➣Application Programmer Interface (less common)
API➣Arab Peace Initiative
API➣Alabama Polytechnic Institute
API➣Academic Programs International (Austin, TX)
API➣Allocation de Parent Isolé (French: Single Parent Allowance)
API➣Analytical Profile Index (microbiology)
API➣American Products, Inc. (Florida)
API➣Année Polaire Internationale (French: International Polar Year; research project)
API➣Application Platform Interface (software)
API➣Armor-Piercing Incendiary (ammunition)
API➣Automated Processes, Inc. (est. 1968)
API➣Arab Planning Institute (Kuwait)
API➣American Press Institute
API➣Australian Property Institute (professional body)
API➣Australian Pipeline Industry
API➣Asian Public Intellectuals
API➣Association of Play Industries
API➣Alaska Psychiatric Institute
API➣Attachment Parenting International
API➣Animal Protection Institute
API➣Advanced Passenger Information
API➣Access Preamble Indicator
API➣Adobe Printing Inks
API➣Associate in Personal Insurance (insurance)
API➣American Professional Institute (Georgia)
API➣Air Pollution Index
API➣Alphabet Phonétique International (French: International Phonetic Alphabet)
API➣Annual Physical Inventory
API➣American Paper Institute
API➣Annual Price Increase
API➣Appleton Papers, Inc. (Appleton, WI)
API➣Avian and Pandemic Influenza
API➣Administración Portuaria Integral (Mexico)
API➣Annual Premium Income
API➣Alpha Processor, Inc. (Samsung)
API➣Angus Productions Inc.
API➣Associazione Piccole e medie Industrie
API➣Advanced Product Information (various businesses)
API➣Alliance for the Polyurethanes Industry
API➣Application Process Integration
API➣Apple Learning Interchange
API➣Athabasca Potash, Inc. (Petaluma, CA)
API➣Asia Pacific Initiative (various organizations)
API➣Asset Priority Index
API➣Athletes' Performance Institute (Tempe, AZ)
API➣American Pain Institute
API➣Assistant Principal for Instruction
API➣Architectural Publications Index
API➣Association of Professional Investigators
API➣A Pressen Interaktiv (Norwegian: Digital Media)
API➣Accelerated Performance Improvement
API➣Antecedent Precipitation Index
API➣Asosiasi Pertekstilan Indonesia (Indonesian Textile Association)
API➣Aviation Preflight Indoctrination
API➣Ansal Properties Infrastructure (India)
API➣Anti-Poverty Initiative (various locations)
API➣Association of Physicians of India
API➣Australian Pharmaceutical Industries Ltd.
API➣Australian Public Intellectual Network (non-profit publisher)
API➣Air Photo Interpretation
API➣Association Psychanalytique Internationale (International Psychoanalytical Association)
API➣Anonima Petroli Italiana SpA (Rome, Italy)
API➣Aircraft Platform Interface
API➣American Prepaid Legal Services Institute
API➣Ascendant Partners, Inc.
API➣Age Participation Index (UK)
API➣Active Pharma Ingredient
API➣Anderson Packaging, Inc. (Rockford, IL)
API➣A Pleasing Interface
API➣Alagus Printer Installer (software)
API➣Announcement of Public Interest
API➣Alice Paul Institute (Mount Laurel, NJ, USA)
API➣Asset Performance Inc. (Vancouver, BC, Canada)
API➣Aerial Photographic Interpretation (American Society of Photogrammetry and Remote Sensing)
API➣Air Position Indicator
API➣Asylum Policy Instruction (UK)
API➣Advanced Polygraph Institute (Australia)
API➣Average Price Index (describes growth rate, related to inflation measurements)
API➣Aromatic Polyimide Insulation
API➣Alt Preset Insane (MP3 encoder preset)
API➣Ankle Pressure Index
API➣Acquisition Program Integration
API➣Applied Planning International Inc.
API➣Agricultural Price Index
API➣Associated Press of India
API➣Automation & Process Industriel (French: Industrial Automation & Process)
API➣Advanced Pharmaceutical Ingredients
API➣Association des Parents Indépendants (French: Independent Association of Parents)
API➣After Project Initiation
API➣American Pirate Industries
API➣Authenticity Probability Index
API➣Absolute Position Indication
API➣Applications, Programs and Indentures
API➣Aircrew Position Indicator (USAF)
API➣Axial Power Indicator
API➣Arithmetic Polynomial Interpolation
API➣Application Programmers Initiative
API➣Application Process Instruction
API➣Arab Payments and Securities Settlement Initiative
API➣Accountable Property Inventory
API➣Automation Proficiency Improvement (US Postal Service)
API➣Automated Physical Inventory
API➣Annual Plan for Instruction
API➣Advertisers Product Index
API➣Agfa and Picker International
API➣Alert Process Improvement (Sprint)
API➣AssassinPokémon Initiative (Anti-Pokemon Organization)
API➣Assistent Project Ingenieur (Dutch: Assistant Project Engineer)
API➣Availability Priority Index
API➣Atlantic Paratrans of NYC, Inc
API➣Association of Physicians in Industry
API➣Automating Peripherals Incorporated
API➣Automated Pellet Inspection
API➣Aisne Plastique Industrie (French: Aisne Plastic Industry; Aisne, France)
API➣Asociación Pueblos Indios (Spanish: Indian Peoples' Association; Costa Rica)

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