Server Side Includes (SSI) is a well-known server-side scripting language, employed to include the content of one file inside of a second file. It is used mainly with online content and it will help to make a static HTML website more dynamic. If you'd like to have a daily quote shown on various web pages within your website, for instance, you can make a text file and replace the quote inside it each day. All the pages in which this file is incorporated are going to display the updated quote, so you'll not need to alter every one of them manually every single time. SSI could also be used to contain the output of simple functions instead of a static file - for example, the client's IP address, a hit counter or even the present date and time. By doing this, you may make your internet site seem much more professional and a lot more appealing to the website visitors. Pages that implement SSI get a .shtml extension.