what is usps first class mail refers to a mail service provided by the United States Postal Service that is designed for sending lightweight packages, letters, and postcards at an affordable price. USPS First-Class Mail is one of the most economical shipping options for small items weighing up to 13 ounces, and it offers delivery speeds ranging from 1 to 5 business days, depending on the distance. First-Class Mail is particularly popular for sending personal letters, small parcels, and business correspondence. For packages that do not require expedited shipping, First-Class Mail provides a cost-effective solution while maintaining reliable delivery. The USPS tracking feature is available for First-Class Mail parcels, which allows senders and recipients to track the package’s status as it moves through the USPS network. Additionally, First-Class Mail is widely used for e-commerce shipments, as it offers competitive rates for small businesses.