This step isn't necessary on more recent iPods and versions of iTunes, but for some earlier iPod models, you need to use it if you want your iTunes album art to display on your iPod's screen.
To do this, begin by syncing your iPod and going to the Music tab. There you'll find a checkbox that says "display album artwork on your iPod." Select that and then when you play songs on your iPod, the album artwork will show up, too.
If you don't see this checkbox when you sync, don't worry. That means your album art will be automatically added.
