Backend development is used in almost the same way as server development.
HTTP = How you should put it in front of your browser (HTTPPS; a more secure request method)
Address to show html, css file = URL or API
Guide users to a specific address based on address = Router
The process of creating a server is to associate a domain with an authorized IP address (deploy the server).
That's all I've organized. I don't know if it went well.I'll try my best!