Apple first unleashed iTunes in 2001 to help iPod owners manipulate their music collections. As iPods evolved to support video and other capabilities, iTunes also advanced. It's the primary software link that lets you transfer music and other media files between your computer and iPod.
With an Internet connection, iTunes opens a whole world of media to your computer. You can purchase and download music, music videos, TV shows, movies and other digital products with just a few mouse clicks. This kind of easy access -- and the ease with which iTunes links with iPods -- is the reason that iTunes has contributed heavily to the company's profits. Since the iTunes store opened, Apple has sold more than 10 billion songs.