Sync is a music synchronization application developed by Amit Amola that organizes users' music libraries into alphabetical order by artist, album, and genre, making it easier to locate songs. It utilizes identification software like Shazam and Soundhound to categorize music and features a built-in radio that allows users to find and download songs they hear. Sync is available for free on iOS, Android, and Windows, with a premium version offering additional features for a nominal fee.