Signal is a free messenger that uses end‑to‑end encryption for text, voice, video, and media. It’s aimed at users who want a privacy‑first communication tool without ads or trackers. What sets Signal apart is its open‑source Signal Protocol, which guarantees that only the participants can read or listen to messages. The app also offers encrypted stickers, group chats, and no‑cost data usage, making it a simple, powerful choice for everyday conversation.