Secure Sockets Layer, or SSL, is a protocol that is used to encode the info exchanged between a server and its users. The practical application of employing an SSL is to preserve the info that site visitors submit on your website - a login page, a payment page if you run a web-based store, etc. Any data they input in any box on the site shall be submitted securely to the server, so their login or payment information shall be protected from being accessed by unauthorized people. Normally, an SSL certificate requires a dedicated IP address to be set up, meaning that the overall cost for your online presence will be bigger. While this may not be a problem for a larger enterprise, it might matter for a non-profit organization or a small web store that doesn't generate big revenue if additional money should be spent. That's the main reason why we have taken advantage of an extension known as Server Name Indication (SNI) and we have made it possible to use a shared server IP address to set up an SSL certificate.