Signal

Signal is a cross-platform encrypted messaging service that allows users to send end-to-end encrypted group and one-to-one text messages, as well as make voice and video calls. It also supports sharing files, images, and other media. The application uses its own Signal Protocol for secure communication.

The service is designed for individuals and groups who prioritize privacy and security in their digital communications. It is available on Android, iOS, and desktop operating systems, offering a secure alternative to standard messaging applications.