Why we use Ajax with HTML ?

Answer 1

Using Ajax, we can work with database (Add/delete/update/search/display data) without reloading the page.

Answer 2

Update a web page without reloading the page

Request data from a server - after the page has loaded

Receive data from a server - after the page has loaded

Send data to a server - in the background

Ref: https://www.w3schools.com/xml/ajax_intro.asp