The new passport card contains an electronic chip that allows immigration officials to access the card holder's biographical information. The chip itself does not contain personal information, it simply allows border officials to access the information which is stored in a secure government database.
The main advantages of the passport card are its cost and practicality. The passport card costs considerably less than a conventional passport, $45 for the first card, which is valid for ten years, as opposed to $100 for a passport. For children the cost is $35 for a card valid for five years. Because of its small size, the passport card will fit in your wallet, as opposed to a passport book which can be impractical to carry.
More frequently asked questions about Mexico travel documents and entry requirements: