Server Side Includes (SSI) is a well-known server-side scripting language, which can be used to include the content of one file within another file. It is used typically with online content and it will help make a static HTML website far more dynamic. If you'd like to have a daily quote shown on multiple pages on your site, as an example, you can create a text file and switch the quote within it every single day. All pages in which this file is included will display the modified quote, so you'll not need to modify all of them personally every single time. SSI can also be used to contain the output of simple functions rather than a static file - for example, the visitor's IP address, a hit counter or maybe the present time and date. In this way, you may make your website look far more professional and a lot more attractive to the website visitors. Web pages that use SSI have a .shtml extension.