What type of media is excluded from Media Mail?

Media Mail is a special mailing service provided by the USPS that allows for the shipment of specific educational or informational materials at reduced rates. However, certain items are excluded from being sent via Media Mail. The correct answer indicates that posters fall into this excluded category.

Posters are not considered "educational" items in the same way that books, sound recordings, and recorded videotapes are. While books convey information and educational content, and sound and visual recordings often serve educational purposes, posters are typically viewed as promotional or decorative items. They do not meet the criteria put forth by the USPS for Media Mail which is intended to facilitate the shipment of materials with a primary purpose of education or information dissemination.

In contrast, books can be sent because they are inherently educational, as well as sound recordings and videotapes, which often hold significant informational value. Thus, the exclusion of posters highlights the specific criteria the USPS uses to define what qualifies for this economical shipping option.