Certified Mail and USPS First-Class Mail are two different services offered by the United States Postal Service (USPS), each with its specific features and purposes. Here are the main differences between Certified Mail and USPS First-Class Mail:

Certified Mail:

1. Delivery Confirmation: Certified Mail provides proof of mailing and delivery. When you send a letter or package using Certified Mail, you will receive a receipt (also known as a "Certified Mail receipt") at the time of mailing. This receipt serves as proof that you sent the item. Additionally, you can track the delivery status of the mailpiece online.

2. Signature Confirmation: Certified Mail includes an option for "Signature Confirmation" at an extra cost. This means the recipient must sign for the mailpiece upon delivery, providing an additional level of accountability and proof of delivery.

3. Return Receipt: For an additional fee, you can request a physical or electronic return receipt when using Certified Mail. The return receipt provides you with the recipient's signature or an electronic confirmation of delivery.

4. Purpose: Certified Mail is often used for important or sensitive documents, legal notices, contracts, official correspondence, or any situation where proof of mailing and delivery is essential.

USPS First-Class Mail:

1. Delivery Speed: USPS First-Class Mail is a standard mail service that is generally used for non-urgent, regular mail items. It offers reliable delivery but does not provide any tracking or delivery confirmation options by default.

2. Weight and Size Limits: First-Class Mail has specific weight and size restrictions. Letters and small packages must meet the USPS size and weight guidelines to qualify for this service.

3. Cost: First-Class Mail is typically more affordable than Certified Mail since it does not include additional tracking, delivery confirmation, or signature requirements.

4. Purpose: First-Class Mail is commonly used for personal and business correspondence, bills, postcards, greeting cards, and other lightweight mail items that do not require special tracking or proof of delivery.

In summary, the primary difference between Certified Mail and USPS First-Class Mail is the level of tracking, delivery confirmation, and proof of delivery provided. Certified Mail offers these additional services and is often used for important or sensitive documents, while USPS First-Class Mail is a standard mail service used for regular correspondence and lightweight items.