If you want to travel internationally, you will likely need a government-issued photo identification document called a U.S. passport book. A passport book contains a passport photo, information about the holder, and blank pages that officials will stamp when the passport holder leaves or arrives in a new country. They also feature a unique, 9-digit passport book number, usually found on the upper-right corner of the second page.
The U.S. also issued passport cards; however, these can only be used when traveling by land or sea to and from a few specific countries. Whereas U.S. passport books can be used to travel internationally by air, land, or sea. Passport books for adults are valid for 10 years from the date of issue, while passport books for children under 16 are only valid for 5 years.
Books for adults: $135 new, $110 for renewals
Books for minors: $105
Cards for adults: $55 new, $30 for renewals
Card for minors: $40