Spotify software version 1.1.28.721 is a music streaming platform that allows users to access a vast collection of songs, albums, and artists. It offers personalized playlists based on user preferences, as well as the ability to create and share playlists with others. Additionally, it has a radio function that plays songs based on a specific genre or artist. The software also includes social features that allow users to follow friends and see what they are listening to.