Server Side Includes (SSI) really is a group of directives that will permit you to contain the content of a text file inside an HTML file. By doing this, you'll be able to add any kind of content to few different web pages in your website and modify it by simply updating just one text file. You're able to additionally incorporate the output of various scripts in order that the current date and time, the IP address of the website visitor or the properties of a file display on your website. This shall allow you to incorporate some dynamic content to static webpages, making the website more inviting to your website visitors and creating a far more professional overall look. It will be simpler to update this content as compared to updating each static web page one by one. If you would like to use Server Side Includes in your site, the pages that include the content of some file need to be with extension .shtml.