Server Side Includes (SSI) is a common server-side scripting language, that is employed to add the content of one file within another file. It is employed mostly with online content and it can help to make a static HTML site more dynamic. If you wish to have a daily quote shown on multiple webpages on your site, as an example, you can make a text file and replace the quote inside it each day. All of the pages where this file is integrated are going to show the updated quote, so you'll not have to update them manually each time. SSI may also be used to include the output of simple functions instead of a static file - for instance, the client's IP address, a hit counter or even the present date and time. In this manner, you can make your internet site look much more professional and a lot more appealing to the site visitors. Pages that use SSI use a .shtml extension.