Passport books and cards are both official documents that can be used to travel internationally. However, there are some key differences between the two. For one, passport books are significantly larger than passport cards, and they contain much more information. In addition to the holder's name, photograph, and signature, passport books also include room for visas, stamps, and other markings. Passport cards, on the other hand, are much smaller and only contain basic information such as the holder's name and photograph. Another key difference is that passport books can be used for all international travel, while passport cards are only valid for travel by land or sea (not by air). As a result, passport books are generally more expensive and time-consuming to obtain than passport cards. However, they offer more flexibility for international travel.
The passport card can be used for travel between the United States, Canada, Mexico, and the Caribbean. You will need to have a passport book if you are going to travel outside of the country.