Server Side Includes (SSI) really is a range of directives that will enable you to include the content of a text file in an HTML file. This way, you'll be able to add any kind of content to numerous pages in your site and change it simply by modifying a single text file. You are able to additionally add the output of different scripts so that the present date and time, the IP address of the website visitor or the properties of some file show on your site. This shall enable you to add some dynamic content to static web pages, making the site more appealing to your site visitors and creating a more professional visual appearance. It will likewise be easier to revise this content as compared to updating each static page one by one. If you want to use Server Side Includes on your website, the web pages that contain the content of some file need to be with extension .shtml.