Server Side Includes

This is a powerful tool for Web developers. Where #command can be any of various commands supported by the Web server.

The simplest command is #include, which will insert the contents of another file. This is especially useful for ensuring that "boilerplate" components, such as headers and footers, are the same on all pages throughout a Web site. This means that you only need to modify the include file, instead of updating each and every web page.