Brett_Tabke - 12:16 am on Sep 8, 2010 (gmt 0)
The definition of what-is-PayPal has changed coniderably over the years. There are several levels of PayPal integration you can use. The cheapest and easiest is processing through paypal where a user leaves your site and then uses paypal to process the cards.
You can step up to Website Payments Pro. You will process cards on your own site and people won't even know that it is PayPal doing the processing. There are several bolt on modules for standard shopping cart systems. This step takes quite a bit more time and effort install, but offers all the benefits of a full payment processor.