RTMP is an acronym for Real-Time Messaging Protocol, which is a streaming protocol developed by Macromedia (now Adobe) for use with its Flash Player. It is designed to stream audio and video content over the Internet, enabling high-quality playback of content in real-time. RTMP is used by many live streaming platforms and services, including Twitch, Facebook, YouTube, and more. It is widely used for delivering live and on-demand video content, especially for broadcasting live events, webinars, and video games.