What are Server-Side Includes or SSI?

"Server-Side Includes" are just that, commands (aka "directives") to the Web server to include some information the server has in the displayed Web page. A common use of SSI is to display the current date and time on a Web page. These commands are enclosed within HTML comment tags () in a Web page so the browser ignores them. These comment tags with an enclosed server command are the "SSI directive tags" that are mentioned below. When these SSI directive tags are used with scripts, the "...information the server has..." is whatever output was generated by the execution of the script.