An API (Application Programming Interface) is a set of features and rules that exist inside a software program (the application) enabling interaction with it through software - as opposed to a human user interface. The API can be seen as a simple contract (the interface) between the application offering it and other items, such as third-party software or hardware.
In Web development, an API is generally a set of code features (e.g., methods, properties, events, and URLs) that a developer can use in their apps for interacting with components of a user's web browser, other software/hardware on the user's computer, or third-party websites and services.
For example:
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HTML:
3.2
| Encoding:
UTF-8
| Version:
0.7.4