Server Side Includes (SSI) is a widely used server-side scripting language, which is used to add the content of one file within a second file. It is utilized typically with online content and it can help make a static HTML website much more dynamic. If you need to have a daily quote shown on a variety of pages on your site, for example, you can make a text file and switch the quote in it every single day. All of the web pages in which this file is incorporated are going to show the modified quote, so you will not need to modify them personally each time. SSI can also be used to contain the output of simple functions instead of a static file - for example, the viewer's IP address, a hit counter or maybe the present date and time. In this way, you may make your internet site seem far more professional and much more appealing to the site visitors. Pages that implement SSI use a .shtml extension.