iTunes software version 10.6.3 is a media player, media library, and mobile device management application developed by Apple. It allows users to organize and play music, movies, TV shows, podcasts, and audiobooks on their computers or mobile devices. The software also includes the iTunes Store, where users can purchase and download music, movies, TV shows, and more. Additionally, iTunes can be used to sync content between Apple devices, backup and restore data, and manage device settings.