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JSONP ( JSON with Padding or JSON-P) is a JSON extension used by web developers to overcome the cross-domain restrictions imposed by browsers' same-origin policy that limits access to resources retrieved from origins other than the one the page was served by. In layman's terms, one website can not just simply access the data from another website.

It was developed because handling a browsers' same origin policy can be difficult, so using JSONP abstracts the difficulties and makes it easier.

JSON stands for "JavaScript Object Notation", a format by which object fields are represented as key-value pairs which is used to represent data.