Communication APIs are pre-built sets of codes that can be integrated into any mobile or web app, to enable interaction features like instant messaging, voice calls, and video calls. These APIs create syntaxes and protocols for exchanging information between two devices or systems which has the same application installed in them. The frameworks of these APIs are added to the build Gradle of Android Apps or imported into the frameworks folder of iOS apps.
Original source: https://en.wikipedia.org/wiki/Communication APIs.
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