Please explain how Ajax works in as much detail as possible.

Ajax works by adding an intermediate layer between the user and the server , which causes the user operation to be asynchronous with the server response . In this way, some of the previous workload of the server is passed on to the client, which is advantageous to the client's idle processing ability to deal with, reduce the burden of server and bandwidth, so as to save ISP 's space and bandwidth leasing cost .

by simply speaking The XMLHttpRequest object sends an asynchronous request to the server, obtains the data from the server, and then uses JavaScript to manipulate the DOM and update the page. One of the most critical steps is getting the request data from the server. To understand this process and principle, we must have some knowledge of XMLHttpRequest.

Please explain how Ajax works in as much detail as possible