iPod's are MP3 players, made by Apple (same company that makes Macintosh computers). Using a free programme called iTunes (available for Windows and for Macintosh) you copy your CDs onto your computer, then copy them onto your iPod. You can set iTunes so that it automatically synchronises the iPod and your computer's music library so that any time you add a new CD it will automatically be copied to the iPod when you next conect it to the computer. Copying your CDs to your desktop computer also means you can play any of your music direct from your hard drive, and information like album titles and track titles are automatically downloaded from the internet.
In addition to copying your CDs you can also buy individual tracks for £0.79 from Appl'e online music store.
Regards
Rob