These are commands that can be included in Web pages that are processed by the Web server when a user requests a file.
HTML-embedded commands executed by the server before sending the HTML file to the client.
A server-side include is a web server directive that is evaluated by the server when a user requests a page. This directive includes HTML or ASP code from another page and inserts it where the directive is placed. The include looks like the following:!-- #include virtual="/include/my_lib.asp" -- Includes may be "virtual" meaning that the file is found based off the web site root or non-virtual using the "file" attribute which locates the file relative to the directory of the current script (with the include directive.)