JsonP[json with Padding]

-Is a method for sending json data without worrying about cross -domain issues.

-Jsonp does not use the xmlhttprequets object to avoid problems,

-because if you are requisting file from anothe domain can problems, due to cross-domain policy.

-Json uses the script tag because when requesting an external script from another domain does not have this problem.

Cross-domain

-Transfere of information between two or more differing security domains.