When writing an internet address in the address bar of the browser and clicking enter to start going to that address, you send a request to the web server and it will follow the address of the URL and will pick up all the contents of the target location.
Always keep in mind that whatever you see in the browser an output of the HTML of the actual code of the web page that you have requested.
What is parsing? It is the process of converting of the code to the HTML that you desire by the engines of the web parser’s servers.
When requesting the URL, the web server will follow the location and request for the contents in that server.