WEBM is a media file format designed for web use. It is based on the VP8 video codec and the Vorbis audio codec, making it highly efficient for video streaming on the web. WEBM supports high-quality video and is supported by most modern browsers, offering an open-source alternative to proprietary formats like MP4.
AVI is a video format developed by Microsoft that stores both video and audio data in a single file container. It supports multiple codecs and is known for delivering high-quality output, though files can be large. AVI is compatible with most media players and remains a reliable format for local video playback.