Quick Answer
jQuery Deferred is a Promise-like object for managing async operations. $.Deferred() creates one; .resolve() fulfills it; .reject() fails it. .then(), .done(), .fail(), .always() attach callbacks. jqXHR (returned by $.ajax) implements Deferred, so you can: var req = $.ajax(url); req.done(fn); req.fail(fn). Useful for wrapping non-Promise async code.
Answer
Deferred object manages async workflow. .resolve() / .reject() control completion. .promise() allows chaining. Useful for dependent AJAX flows.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
