what’s the difference between first class and priority mail

what’s the difference between first class and priority mail lies in speed, cost, and weight limits. USPS First Class Mail is intended for lightweight packages (under 16 oz) and is generally more affordable but slower, taking 2–5 business days. Priority Mail accommodates packages up to 70 lbs, offers 1–3 day delivery, includes tracking and insurance, and has both flat-rate and variable pricing options. For faster service or heavier items, Priority Mail is often the better choice. Understanding these differences helps e-commerce sellers and individuals choose the most cost-effective and timely option for their shipping needs.