Server Side Includes (SSI) is a popular server-side scripting language, that is employed to add the content of one file inside of a second file. It is utilized predominantly with online content and it can make a static HTML site more dynamic. If you need to have a daily quote displayed on various web pages of your website, for instance, you can create a text file and replace the quote in it daily. All the web pages in which this file is incorporated will show the modified quote, so you will not need to change all of them personally every time. SSI may also be used to include the output of simple functions as opposed to a static file - for example, the viewer's IP address, a hit counter or maybe the current date and time. This way, you may make your site appear much more professional and more appealing to the site visitors. Web pages that employ SSI have a .shtml extension.