Android Beam is a feature of the Android mobile operating system to allow data to be transferred via near field communication (NFC). It allows the rapid short-range exchange of web bookmarks, contact info, directions, YouTube videos, and other data. Android Beam was introduced in Android version 4.0 (Ice Cream Sandwich).
Usage
Android Beam is activated by placing devices back to back with the content to be shared displayed on the screen. If the content is able to be sent, the screen will shrink down and display Tap to Beam at the top. Tapping the screen sends the content from the one device to the other. A sound will play when devices are near and able to beam. When the data is sent, a confirmation tone will play or a negative tone will play if failed and the content will shrink off the screen indicating beaming is complete. Sharing is one direction and the device sending content will not get content from the receiving device.
Requirements
To activate Android Beam, both devices must support NFC (Near field communication) and have it enabled in addition to passing the lock-screen or logging in.
Source: Wikipedia
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