5KPlayer software (version 4.1) is a multimedia player that supports various video and audio formats including 4K, 5K, and 8K. It also supports the playback of online videos from YouTube, Vimeo, and other video sharing sites. The software features an AirPlay function, allowing users to stream media from their iPhone or iPad to their computer. Additionally, it includes a built-in radio player and the ability to download videos from online sources.