What kind of file is asp?

ActiveServerPages(ASP) is a server-side scripting environment that can be used to create and run dynamic and interactive Web server applications. With ASP, you can combine HTML pages, VBScript script commands and JavaScript script commands to create interactive Web pages and powerful Web-based applications.

Because the script runs on the server instead of the client, the Web pages transmitted to the browser are generated on the web server. So don't worry about whether the browser can handle the script well: the Web server has completed all the script processing and transmitted the standard HTML page to the browser. Because only the results of the script are returned to the browser, the server-side script is not easy to copy. Users can't see the script command that creates the page they are browsing.