Instant Messaging App

An instant messaging app is an application that provides real-time online communication that connects two or more people, usually by exchanges of text, audio, files, and video communication.

Signal is the clean winner among instant messaging apps when it comes to security. All Signal messages are encrypted end-to-end by default, which means that no one, not Signal, not your phone company, not the government, but you and the people you're chatting with can access your messages.