Server Side Includes (SSI) is a popular server-side scripting language, used to include the content of one file inside a second file. It is employed mainly with online content and it can make a static HTML website much more dynamic. If you need to have a daily quote shown on multiple webpages within your site, for example, you can make a text file and replace the quote in it every day. All web pages where this file is integrated will show the modified quote, so you will not have to alter all of them personally each time. SSI can also be used to include the output of basic functions rather than a static file - for example, the visitor's IP address, a hit counter or the current time and date. In this manner, you may make your internet site look much more professional and much more attractive to the site visitors. Web pages that employ SSI use a .shtml extension.