What are the differences between a passport card and an enhanced license, and which one would be more suitable for international travel?

A passport card is a limited travel document that can only be used for land and sea travel to certain countries, while an enhanced license is a state-issued driver's license that can be used for land and sea travel to Canada, Mexico, and some Caribbean countries. For international air travel, a traditional passport book is required. If you plan to travel internationally by land or sea to the specific countries allowed by a passport card, it may be more suitable. Otherwise, a traditional passport book is recommended for international travel.