There's an iSight camera built into every iMac, so you can start a video chat (or join one) at a moment's notice. There's nothing extra to buy, nothing to attach, no cords to fumble with, no softw are to install or configure. Simply start up iChat AV, click your buddy's video icon and you™re read y to chat with sight and sound--with up to three friends at once. Proper attire suggested.