what is the difference between standard and first class mail

what is the difference between standard and first class mail is a question often asked by customers looking to send mail through USPS. Standard Mail, also known as Marketing Mail, is a more affordable option typically used for bulk mailings like flyers, catalogs, and promotional materials. First-Class Mail, on the other hand, is faster and more reliable, typically used for letters, postcards, and small parcels. First-Class Mail offers better delivery times, usually within 1-3 days, while Standard Mail can take longer.