What differances between PayPal and credit/debit cards should I be aware of when buying online?

[Mr. Ryan]

I live in the UK so just bear that in mind. Sometimes Yahoo Answers says I live in the USA for some reason.

I would like to know the strengths and weaknesses of each method of payment. I realized Amazon.com doesn't accept PayPal so I find that curious.

 

[flash84]

Paypal uses your bank account if you dont have a credit card.