Server Side Includes (SSI)

Server Side Includes let you take multiple files and combine them into one working file before the document is sent to the user. SSI makes it easier to maintain large sites by allowing you to change only one file instead of the entire site. SSI also has other applications such as including the current date, the last time the document was updated, the URL of the current page, and more. Files that are parsed by the server sometimes have the extension *.shtml or *.shtm.