Server Side Includes (SSI) is a widely used server-side scripting language, employed to include the content of one file inside of another file. It is utilized principally with online content and it can help make a static HTML website much more dynamic. If you need to have a daily quote displayed on many webpages of your site, for example, you can make a text file and switch the quote in it each day. All of the pages where this file is incorporated are going to show the updated quote, so you'll not have to update every one of them by hand every single time. SSI may also be used to incorporate the output of basic functions instead of a static file - for instance, the viewer's IP address, a hit counter or maybe the present date and time. In this way, you can make your site seem much more professional and a lot more attractive to the website visitors. Web pages that implement SSI have a .shtml extension.