This is an abbreviation for Secure Sockets Layer. This is a common protocol used to communicate information securely online. This protocol provides a safe path that runs between two Internet-connected machines or two machines on the same internal network. It is an extremely handy tool used by web browsers who need to connect securely to a web server, given the wild insecurity inherent in the Internet. SSL usually operates and sets up a secure session with little or no interaction from the person actually visiting the web site. You may notice the browser displaying a padlock or the address showing a padlock and a green bar – those are the hallmarks of SSL doing its magic.