is regular mail first class mail

is regular mail first class mail Regular mail is typically referred to as First-Class Mail in the United States Postal Service system. First-Class Mail is a standard mail service offered by USPS for sending letters, postcards, and small packages. This service is ideal for lightweight items and offers delivery within 1 to 3 business days for domestic shipments. First-Class Mail is an affordable option and includes services like tracking for certain items, but it is not as fast as Priority Mail or other expedited shipping options.