If I can just add to that:
iPod/iTunes You can transfer songs from your library to a portable digital music player, such as the Apple iPod. iTunes works with several players. For the latest information, see this article on the Apple Support website:
www.info.apple.com/kbnum/n93548.
By default, iTunes is set to update iPod automatically. When you connect your iPod to your computer, iTunes opens, then transfers all selected songs in your library and playlists to your iPod, and erases songs from iPod that aren't in the iTunes music library. If you add additional songs to your library during a session and want to add them to iPod, choose File > "Update songs on iPod."