Signal

Signal is a free, open-source messaging application focused on privacy and security. It utilizes end-to-end encryption through the Signal Protocol, ensuring that only the sender and receiver can read messages. The architecture is designed to minimize data retention; messages are not stored on Signal's servers after delivery. It supports text, voice, video calls, and file sharing. Signal's value proposition lies in its commitment to user privacy through encryption and its non-profit status, guaranteeing that user data is not monetized through advertising or tracking. Use cases include secure communication for journalists, activists, and anyone concerned about privacy.