PayPal allows consumers who have email to send payments online safely, conveniently and profitably. The PayPal network relies on the existing financial infrastructure of bank accounts and credit cards to create a global real-time payment solution. Paypal offers a service specially designed for those who are not satisfied with traditional payment mechanisms.
For more information you can visit the Paypal website. http://www.paypal.com
To be able to pay by debit / credit card you just have to choose the payment option by Paypal and click on the "Pay with card" button. Paypal is a totally secure payment gateway.