A WPL file is a playlist file used by Windows Media Player. It's an XML-based format that contains a list of media files (audio and video) and their locations, allowing Windows Media Player to play them in a specific order. The WPL file itself doesn't contain the actual media data; it only holds references to the media files stored elsewhere on your computer or network. This makes WPL files relatively small in size. They are used to organize and manage collections of music and videos, allowing users to create custom playlists for different moods, genres, or activities. The playlist can include local files, network streams, and even URLs pointing to online media. WPL files are specific to Windows Media Player, although other media players may be able to import or convert them.