AJAX communication flow describes how data moves between the browser and the server.
This flow explains what happens from the moment a user performs an action until data appears on the screen.
The process starts when a user clicks a button, submits a form, or types in an input field.
After the action, JavaScript creates an AJAX request.
The request is sent to the server in the background.
The server receives the request and processes it.
It may read data from database or perform calculations.
After processing, the server sends a response back to the browser.
Finally, JavaScript updates only the required part of the page.
The page does not reload.
This complete cycle is called the AJAX communication flow.
Understanding this flow is essential before writing advanced AJAX logic.