SSL is short for Secure Sockets Layer. The SSL protocol was developed by Netscape and is supported by all popular web browsers such as Internet Explorer, Firefox, Chrome and Opera. For SSL to work a SSL certificate issued by a Certification Authority must be installed on the web server, SSL can then be used to encrypt the data transmitted (secure SSL transactions) between a browser and web server (and vice versa). Browsers indicate a SSL secured session by changing the http to https and displaying a small padlock. Website visitors can click on the padlock to view the SSL certificate.