Server Side Includes (SSI) is actually a list of directives that will permit you to incorporate the content of a text file within an HTML file. By doing this, you can add any kind of content to numerous pages on your website and change it simply by editing one text file. You are able to also incorporate the output of various scripts so that the present date and time, the IP address of the visitor or the properties of some file appear on your website. This shall let you add in some dynamic content to static webpages, making the website more inviting to your site visitors and creating a more professional overall appearance. It will be quicker to revise this content when compared with editing every static web page one by one. If you wish to use Server Side Includes in your website, the pages that include the content of any kind of file must be with extension .shtml.