difference between json and ajax? when should what be used?

dryncattecy

New Member
Hello I am completely confused between json and ajax. When would what be used. I work with PHP on the server side. I regularly use ajax to receive data asynchronously, without invoking a page load. I use php's json functions to pass data to javascript. But I just started learning jQuery, and I am completely confused when to use function ajax and when to use json. Can somebody help me out with this, thanks.
 
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