is first class regular mail

is first class regular mail is a common question for those who want to know the difference between USPS First-Class Mail and other USPS services. First-Class Mail is the standard mail option for sending letters, postcards, and small parcels. It’s known for being affordable, with delivery typically taking 1-3 business days within the United States. It is not as fast as Priority Mail or Express Mail, but it is a reliable option for less urgent shipments and small items weighing up to 13 ounces. First-Class Mail is a popular choice for personal letters, invoices, and lightweight packages.