Server Side Includes (SSI) is a list of directives that will allow you to include the content of a text file within an HTML file. In this way, you are able to add any kind of content to various pages in your website and change it just by editing a single text file. You're able to additionally add the output of distinctive scripts so that the current time and date, the IP address of the website visitor or the properties of a file show up on your site. This shall let you add some dynamic content to static pages, making the website more inviting to your site visitors and giving it a professional overall appearance. It will be simpler to update this content in comparison with updating each static page one at a time. If you wish to use Server Side Includes in your site, the pages that include the content of some file must be with extension .shtml.