Deploying a server-side server means that the speed and responsiveness of websites aren’t anchored by the processing capabilities of a local machine, and allow web pages to be programmed in languages beyond JavaScript. This is as opposed to a client-side framework, such as Angular, React and Ember. Unless ASPX files are being used to configure a web server, users shouldn’t need to interact with them, or even see them. They’re entirely used for back-end configurations. If users do see them, it means something’s gone horribly wrong with the server of the site they’re trying to reach.