ITunes

iTunes is Apple's music and video management software. It also serves as a desktop client for the iTunes Store and handles iOS device synchronization.

It consists of 3 major components: iTunes itself, QuickTime and Apple Mobile Device Support (AMDS). QuickTime is used for audio/video playback and encoding, while Apple Mobile Device Support is the component responsible for synchronizing with iOS devices.

Starting with version 9, iTunes on Windows includes a component called Apple Application Support, which is essentially WebKit. It is used to display the iTunes Store, as well as iTunes LPs and iTunes Extras.