Server Side Includes (SSI) is a common server-side scripting language, that is employed to add the content of one file inside another file. It's utilized mainly with online content and it will help make a static HTML site more dynamic. If you want to have a daily quote displayed on a number of webpages on your site, for instance, you can create a text file and switch the quote inside it every day. All of the web pages in which this file is integrated are going to display the modified quote, so you'll not need to update every one of them personally every single time. SSI could also be used to contain the output of simple functions as opposed to a static file - for example, the visitor's IP address, a hit counter or the present date and time. This way, you may make your internet site look more professional and more attractive to the site visitors. Web pages that use SSI get a .shtml extension.