what is the difference between first class and priority mail

what is the difference between first class and priority mail comes down to delivery speed, weight limits, and pricing. USPS First-Class Mail is intended for lightweight items (under 16 oz) and is generally cheaper, but delivery takes 2-5 business days. Priority Mail supports heavier items (up to 70 lbs) and delivers faster—typically within 1-3 business days. Priority Mail also includes tracking and $100 insurance, whereas First-Class only includes tracking without insurance. For valuable or time-sensitive shipments, Priority Mail is the preferred option. Businesses often choose between these services based on item weight, urgency, and cost considerations.