what is this paypal could any one tell me

PayPal is an account-based system that lets anyone with an email address securely send and receive online payments using their credit card or bank account. It is the most popular way to electronically pay for eBay auctions and it is becoming a cheap way for merchants to accept credit cards on their on-line storefronts instead of using a traditional payment gateway. Its free to open an account.

Paypal is free to use, and you only need to pay if you want to use their additional services. You should really read those information at www.paypal.com Please go and read instead of asking here.