HandBrake is a free and open-source transcoding software that enables users to convert digital video files from one format to another. It supports a wide range of video and audio formats, such as MKV, AVI, MP4, and more. HandBrake also provides a wide range of options for customization, such as video and audio bitrate, quality settings, and subtitles. Additionally, it has the ability to create high-quality encodes for various devices, such as AppleTV, PlayStation, and Xbox.