Plex Home Theater software is a media player that allows users to stream and playback various types of media, including movies, TV shows, and music. It supports a wide range of file formats and can access content from local drives, network shares, and online sources. The software also includes features such as customizable user interfaces, subtitle support, and the ability to sync media across multiple devices. Additionally, Plex Home Theater offers advanced settings for audio and video playback, including support for up to 7.1 surround sound.