Server Side Includes (SSI) is a set of directives that will permit you to contain the content of a text file in an HTML file. This way, you can add any kind of content to few different web pages in your website and adjust it by just updating one text file. You're able to furthermore add the output of distinctive scripts in order that the present time and date, the IP address of the website visitor or the attributes of some file show up on your website. This will let you add some dynamic content to static web pages, making the site more desirable to your website visitors and giving it a much more professional overall look. It will likewise be simpler to update this content as compared to updating every static web page one by one. If you wish to use Server Side Includes on your site, the pages that contain the content of any kind of file need to be with extension .shtml.