AJAX Interview Questions:

What is AJAX?
How does AJAX improve web application performance?
What are the main components of an AJAX request?
What are the different methods used to make an AJAX request?
What is the XMLHttpRequest object?
How can you handle AJAX errors?
What is the difference between synchronous and asynchronous requests in AJAX?
How can you send data with an AJAX request?
What is the `readyState` property in an AJAX request?
What are the possible values of `readyState` in an AJAX request?
What is the `status` property in an AJAX response?
What is JSON and how does it relate to AJAX?
How do you send and receive JSON data in an AJAX request?
What is the role of the `callback` function in AJAX?
How do you handle cross-origin requests with AJAX?
What is CORS (Cross-Origin Resource Sharing)?
What is the Fetch API and how does it compare to XMLHttpRequest?
What is the purpose of the `async` and `defer` attributes in script tags for AJAX?
How do you handle AJAX in jQuery?
What is the `$.ajax()` method in jQuery?
What are the common use cases of AJAX in web applications?
How do you handle timeouts in AJAX requests?
What is an AJAX loader and how is it used?
How do you handle multiple AJAX requests simultaneously?