How does Jsonp Solves CORS policy problem?

You can't request an xml or json or html from external origin (other domain etc) but you can request a javascript file from any domain, JSONP uses this advantage and wraps the data in a function, now browser starts considering them as a javascript function so they don't give any CORS warning.

{
"Name" : "Sachin",
"Gender" : "Male",
"DOB" : "08/10/1995",
"Salary": 10000
}

JSONP will wrap the data in a function as shown below

CallbackFunction({
"Name" : "Sachin",
"Gender" : "Male",
"DOB" : "08/10/1995",
"Salary": 10000
})