Which service is typically the most common type of mail utilized?

First-Class Mail is the most common type of mail utilized because it provides reliable and efficient delivery for various types of correspondence, including letters, postcards, and small parcels. This service allows for quick delivery, typically one to three business days within the contiguous United States, making it attractive for both personal and business use.

First-Class Mail is designed for time-sensitive documents and can be sent at an affordable rate, which contributes to its prevalence among users. Furthermore, it includes essential features such as forwarding and return services, enhancing its convenience for senders.

In contrast, other services like Priority Mail Express are used less frequently due to their higher costs and specific delivery requirements, while Standard Mail and Media Mail cater to different purposes, such as bulk advertisements and educational materials, respectively. These factors contribute to First-Class Mail being the go-to option for everyday mailing needs.