I don't understand jsonp.
I understand JSON. I don't understand JSONP. Wikipedia is the top search result for JSONP. It says JSONP or "JSON with padding" is a JSON extension wherein a prefix is specified as an input argument of the call itself.
Huh? What call? That doesn't make any sense to me. JSON is a data format. There's no call.
I can sort of understand that, but it's still not making any sense.
What is JSONP, why was it created (what problem does it solve), and why would I use it?
Addendum: I've updated Wikipedia with a clearer and more thorough description of JSONP, based on jvenema's answer. Thanks, all.
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