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....can be used to grab audio and video from a user's webcam, which...developer, for example, recording video and audio, broadcasting it to...