A U.S. Passport Book is an government issued identification document with several blank pages used to travel abroad. These blank pages are used for visas and stamps whenever the holder enters or exits a country.
What is the Passport Book number? Where is it?
In the U.S., the Passport Book number is a 9-digit number located on the upper-right corner of the second page (or the page with the person's picture).
What is the difference between a passport book and a passport card?
A U.S. passport book can be used for international air travel, opposed to a passport card that can only be used at certain crossings. U.S. passport books are more expensive than passport cards. Passports are valid for 10 years for adults, and 5 years for children under 16 years of age.
Regarding prices, U.S. passport books cost 135 USD for adults and 105 USD for minors, while passport cards are 55 USD for adults and 40 USD for minors. For renewals, passport books have a 110 USD fee and passport cards a cost of 30 USD.