Secure Sockets Layer (SSL) is a security protocol for the Internet that establishes an encrypted link between a web server and browser to help ensure privacy. An SSL connection always begins with a “handshake,” which fulfills any authentication requirements needed for the connection between server and browser. Afterward, SSL’s job is to encrypt and decrypt any and all information being shared between the server and client.
For instance, this is the technology used when you make a purchase over the Internet; it ensures that your personal information (such as address, Social Security Number, credit or debit card information, etc.) cannot be viewed or stored by anyone other than the intended party.