Server Side Includes (SSI) is a common server-side scripting language, employed to add the content of one file inside of another file. It's employed primarily with online content and it can help make a static HTML site far more dynamic. If you need to have a daily quote displayed on numerous webpages on your site, as an example, you can create a text file and switch the quote in it daily. All webpages where this file is integrated will show the modified quote, so you will not have to alter them manually every single time. SSI may also be used to incorporate the output of simple functions as opposed to a static file - for example, the visitor's IP address, a hit counter or the present time and date. In this way, you may make your internet site look a lot more professional and a lot more appealing to the site visitors. Pages that employ SSI use a .shtml extension.