Server Side Includes (SSI) really is a range of directives that will enable 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 numerous webpages on your site and modify it just by editing a single text file. You are able to additionally add the output of various scripts in order that the current time and date, the IP address of the website visitor or the properties of some file appear on your website. This will help you incorporate some dynamic content to static webpages, making the site more desirable to your website visitors and creating a much more professional overall appearance. It will also be simpler to revise this content as compared to updating each static page one at a time. If you would like to use Server Side Includes on your website, the pages that incorporate the content of some file must be with extension .shtml.