Server Side Includes (SSI) is a well-known server-side scripting language, which is often used to include the content of one file inside of another file. It is utilized principally with online content and it can help make a static HTML website a lot more dynamic. If you need to have a daily quote displayed on several web pages on your website, for instance, you can create a text file and replace the quote inside it each day. All of the web pages in which this file is incorporated will show the updated quote, so you will not have to modify every one of them manually every time. SSI could also be used to contain the output of simple functions instead of a static file - for instance, the viewer's IP address, a hit counter or even the current date and time. This way, you may make your internet site seem a lot more professional and a lot more appealing to the website visitors. Pages that implement SSI use a .shtml extension.