@lolahunt From the Signal website:
Send high-quality group, text, voice, video, document, and picture messages anywhere in the world without SMS fees.
Make crystal-clear voice and video calls with no long-distance charges.
Signal messages and calls are always end-to-end encrypted and painstakingly engineered to keep your communication safe. We can't read your messages or see your calls, and no one else can either.
Keep your chat history tidy with messages that you can set to disappear.