SSL is a security feature that is used most commonly to secure server to browser transactions, although can also be used to secure email transactions, as well as FTP, and other misc. communications. SSL protects data submitted over the Internet from being intercepted and viewed by unintended recipients. Whenever a browser connects to a website with https://, this shows that the connection is encrypted and secure. An SSL Certificate issued by a CA (Certification Authority) not only allows the data to be encrypted, but also lets your visitors have a feeling of "trust" as your business information will be stored in the certificate, viewable to all visitors.