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API

API
1. Application Programming Interface. The definition of procedures (and protocols) that a software application can make use of.

Examples of APIs include those which provide access to a library of useful routines, or access to a device (although this might also require the installation of a suitable device driver).

For more information see:

2. Advance Passenger Information (system). A system for an airlines to send passenger information to a destination airport for customs and immigration purposes before the flight leaves.