Server Side Includes (SSI) is a popular server-side scripting language, which is used to add the content of one file inside a second file. It's used mostly with online content and it could make a static HTML website more dynamic. If you wish to have a daily quote displayed on many webpages within your website, as an example, you can create a text file and replace the quote in it every single day. All of the pages in which this file is included will show the modified quote, so you'll not need to edit all of them personally each time. SSI may also be used to contain the output of basic functions as opposed to a static file - for instance, the visitor's IP address, a hit counter or maybe the current time and date. By doing this, you may make your internet site look a lot more professional and a lot more attractive to the website visitors. Pages that implement SSI get a .shtml extension.