WEBM is a modern video file format designed for the web. It uses efficient compression techniques to deliver high-quality video while keeping file sizes small. This makes it ideal for streaming and sharing videos online, as it reduces loading times and bandwidth usage. The WEBM format supports various video codecs, including VP8 and VP9, and audio codecs like Opus and Vorbis. It is widely supported by major web browsers, making it a popular choice for web developers looking to enhance user experience with smooth video playback.