1. AJAX allows asynchronous data loading without page reloads, while jQuery is a JavaScript library that simplifies DOM manipulation. AJAX relies on technologies like CSS, HTML, and DOM, while jQuery provides functionality through front-end scripting. Heavy AJAX usage can overload servers due to many connections, unlike jQuery.
2. AJAX supports asynchronous server-side requests and loading, while JavaScript is a client-side scripting language for dynamic web pages. AJAX does not install trojans, unlike JavaScript.
3. AJAX is a group of asynchronous JavaScript technologies, while PHP is a server-side scripting language for dynamic web pages. PHP is standalone, while AJAX needs specific platforms