Signal Messenger is an encrypted messaging app known for its strong focus on privacy and security. It's available for smartphones (iOS and Android) as well as desktop platforms (Windows, macOS, Linux). Here's an overview of its key features:
End-to-End Encryption: Signal uses end-to-end encryption for all messages, calls, and video chats. This means that only the sender and the recipient can read the messages, and nobody in between, not even Signal itself.