Server Side Includes (SSI) is a common server-side scripting language, which is used to add the content of one file inside a second file. It is utilized typically with online content and it will help to make a static HTML website a lot more dynamic. If you need to have a daily quote displayed on many webpages of your site, for example, you can create a text file and switch the quote in it every day. All the web pages where this file is included will show the updated quote, so you will not have to edit all of them manually each time. SSI may also be used to incorporate the output of basic functions rather than a static file - for instance, the viewer's IP address, a hit counter or the present time and date. In this manner, you can make your website seem much more professional and more attractive to the visitors. Web pages that implement SSI have a .shtml extension.