The private SSL certificate is an important upgrade to your website. The basic function of an SSL is to encrypt all communication between the browser and the server, ensuring that all data goes through a secure (HTTPS) connection. An SSL certificate is a necessity when you want to operate an online shop and process the sensitive customers data through your software. It helps you gain your clients’ trust and increase your web site’s search engines rank.
The certificate could be easily enabled through the Magento Admin area -> System -> Configuration -> Web. There you can define the insecure (non-SSL) and secure (SSL) URLs:
Bear in mind that the SSL connection over HTTPS is slower than the HTTP, thus secured connection should be applied only to the pages that contain and process sensitive information. Also, it is recommended to run the admin interface through an SSL. In this way you will increase the security of the script’s backend.