Paypal is the most used payment processor.
It can be used for sending payments, like for bought online goods or for paying hosting bills.
Paypal is allowing to receiving payments, like from survey site or job portals.

The big plus point for paypal are its security. All effected transactions can be chancelled beetween 24 hours by logging in to your personal member area. In case somebody have booked unauthorized money from your account or if you have been scammed, you may file a claim to Paypal support.

Do you know Paypal and do you use it currently?