Server Side Includes (SSI) really is a set of directives that will permit you to incorporate the content of a text file inside an HTML file. In this manner, you are able to add some content to various web pages on your website and alter it by simply modifying a single text file. You can additionally add the output of different scripts so the current time and date, the IP address of the visitor or the attributes of some file show up on your site. This shall allow you to add some dynamic content to static pages, making the site more inviting to your website visitors and creating a more professional overall appearance. It will likewise be quicker to update this content compared to updating every static page one at a time. If you wish to use Server Side Includes in your site, the web pages that contain the content of some file must be with extension .shtml.