Complex sentence: JSONP or "JSON with padding" is a communication technique used in JavaScript programs running in web browsers to request data from a server in a different domain, something prohibited by typical web browsers because of the same origin policy.
Split into simpler sentences: JSONP or "JSON with padding" is a communication technique used in JavaScript programs which run in Web browsers. It provides a method to request data from a server in a different domain, something prohibited by typical web browsers because of the same origin policy.