Signal is a privacy-focused messaging app that provides end-to-end encrypted text messaging, voice calls, video calls, and media sharing. Developed by the Signal Foundation, a nonprofit organization co-founded by Moxie Marlinspike and Brian Acton in 2018, Signal uses the open-source Signal Protocol which has become the gold standard for secure communication. The app supports disappearing messages, screen security features, and sealed sender technology that hides metadata. Signal does not collect user data, show ads, or track users in any way. It supports group chats, group video calls, stories, and username-based contact discovery. Signal is available on iOS, Android, Windows, macOS, and Linux, making it one of the most widely accessible secure messaging platforms.
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