jonah--you don't know what paypal is? No offense meant, but you've never heard of it? Let me refresh your memory.
Paypal is a billing system used by many online stores and auctions, so, instead of giving the store you credit card #, you tell them your paypal username, and you get billed.
Kaiden, IMH paypal just makes everything a lot easier--though you shouldn't take my word--what do I know? I'm only 15