What is the difference between a passport card and a passport book?
The passport card is the wallet-size travel document that can only be used to re-enter the United States at land border-crossings and sea ports-of-entry from Canada, Mexico, the Caribbean, and Bermuda. The card provides a less expensive, smaller, and convenient alternative to the passport book for those who travel frequently to these destinations by land or by sea. The passport card cannot be used for international travel by air.

