Server Side Includes (SSI) is a popular server-side scripting language, used to include the content of one file inside another file. It's employed typically with online content and it could help to make a static HTML site more dynamic. If you'd like to have a daily quote shown on several pages of your website, as an example, you can make a text file and switch the quote within it daily. All pages in which this file is integrated will display the updated quote, so you'll not have to alter all of them manually every time. SSI may also be used to include the output of simple functions rather than a static file - for example, the visitor's IP address, a hit counter or perhaps the current date and time. In this manner, you may make your site appear much more professional and much more attractive to the site visitors. Web pages that implement SSI get a .shtml extension.