what is difference between first class and priority mail

what is difference between first class and priority mail refers to the distinction between two shipping options provided by USPS in the United States. First Class Mail is generally used for small, lightweight packages (up to 13 ounces) and is the most economical option for sending letters and small parcels. Priority Mail, on the other hand, is a faster service that offers delivery within 1 to 3 business days, with a higher price point for packages weighing over 13 ounces. Priority Mail also includes free tracking and insurance for certain items, while First Class Mail may not include these features.