AJAX is an acronym for Asynchronous JavaScript and XML. AJAX is a method for building dynamic and speedy web pages. By sharing small quantities of data with the server behind the scenes, AJAX allows web pages to be updated asynchronously. This means that elements of a web page can be updated without reloading the entire page.
Prerequisites.
The Uploading of Files in PHP Process.
Make an HTML form.
File Upload Form with jQuery and AJAX.
Use PHP to configure and connect to a MySQL database.
Write a PHP script to upload files.
Verify that the upload is free of problems.
Ajax is used to conduct a callback, which is a brief round trip to and from the server to obtain and/or save data without having to reload the full page. Network consumption is reduced and operations are completed faster by not doing a full postback and sending all form data to the server.
Explanation: AJAX has two important features: Request information from the server without having to reload the page. Data from the server is received and processed.
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