Server Side Includes (SSI) is a range of directives that will permit you to include the content of a text file inside an HTML file. In this way, you'll be able to add any kind of content to few different pages on your site and adjust it by simply editing one text file. You can also incorporate the output of various scripts so that the current date and time, the IP address of the website visitor or the attributes of a file appear on your website. This will allow you to add in some dynamic content to static web pages, making the website more inviting to your site visitors and creating a far more professional look and feel. It will likewise be easier to update this content in comparison to editing each static page one by one. If you would like to use Server Side Includes on your website, the pages that include the content of any kind of file should be with extension .shtml.