is first class mail regular mail

is first class mail regular mail First-Class Mail is a standard postal service provided by USPS that is considered the “regular” mail option for letters, postcards, and small packages. It is a cost-effective method for sending lightweight items domestically. First-Class Mail is typically delivered within 1-3 business days, making it faster than regular mail services. This service also includes tracking for certain types of shipments, such as First-Class Package Service.