SSL stands for Secure Socket Layer. In simplest terms, SSL is a protocol designed to securely transfer information over the Internet. It is widely adopted and used by the Payment Gateway Providers (Compare Payment Gateways) to secure Credit Card information while consumers submit their credit card info for online purchase.
Information sent through an SSL link is encrypted so that the information is NOT tampered with while the transfer is taking place. Even if it’s being tapped by malicious hacker, the info is meaningless since it has been encrypted. When users access a page secured with SSL using Chrome, Firefox, Internet Explorer, a lock symbol will appear like below: