$.ajax({
        type: 'POST',
        url: path,
        data: '{AreaID: ' + parentDropdownList.val() + '}',
        contentType: 'application/json; charset=utf-8',
        dataType: 'json',
        success: function(response)
        {

        }
    });

In above code I am using type: 'POST'. My senior told me that I also can use 'GET' in type. But dint find the difference between 'POST' and 'GET' and I also want to know what is the use of type, contentType, and dataType.

Could anyone one explain me why we use these type, contentType and dataType.

Thanks in advance.