WebM is an open, royalty-free media file format designed for the web. It is primarily used for video streaming and is supported by various web browsers, making it a popular choice for online video content. The format is optimized for high-quality video playback while maintaining a smaller file size, which is essential for efficient streaming. Developed by Google, WebM uses VP8 or VP9 video codecs and Opus or Vorbis audio codecs. This combination allows for high-quality video and audio compression, making it suitable for a wide range of applications, from video sharing platforms to web-based video conferencing.