what is signal app

Signal is an encrypted messaging app that offers instant messaging, voice, and video calls. It allows users to send text, voice notes, images, videos, and other files. The app uses a centralized computing architecture and is cross- platform software, developed by the non-profit Signal Foundation and its subsidiary, Signal Messenger LLC. It is free, open-source, and built for privacy, with strong end-to-end encryption that keeps communication completely private. Signal is available for Android, iOS, and desktop platforms, and it is supported by grants and donations from users. It has been recommended for its security features by various organizations and has gained popularity for its focus on privacy and security