difference between priority mail and first class

Difference between Priority Mail and First Class involves several key factors, including the speed of delivery, cost, and package weight limits. USPS Priority Mail is a faster service, generally delivering packages within 1-3 business days, and it offers free tracking and insurance up to $100 for domestic shipments. Priority Mail is ideal for heavier packages, as it allows shipments up to 70 lbs. In contrast, First Class Mail is designed for lighter items, such as letters and small parcels, and typically delivers within 1-5 business days. First Class is more affordable but does not offer the same level of insurance or tracking as Priority Mail. First Class Mail has weight limitations, with packages weighing up to 13 oz being eligible for this service.