is a small green or white card given to all Nonimmigrants when they enter the U.S.. The I-94 card serves as evidence that a Nonimmigrant has entered the country legally and also governs the Non-Immigrant's authorized period of stay in the U.S.
An “I-94 Card†is a small white card issued by U.S. Immigration to be retained in the passport for the duration of the visit to the U.S. to record the dates of entry and exit of all non-U.S. citizens. Except for permanent residents of the U.S., I-94 Cards list the date by which the holder must exit the U.S., and I-94 Cards are surrendered to the airline, other transportation company, or Immigration upon exit.
The I-94 card is a small green or white card given to all nonimmigrants when they enter the United States. The I-94 card serves as evidence that a nonimmigrant has entered the country legally. It is stamped with a date indicating how long the nonimmigrant may stay for that particular trip. It is this date -- and not the expiration date of the visa -- that controls how long a nonimmigrant can remain in the United States. A new I-94 card with a new date is issued each time the nonimmigrant legally enters the United States. Canadian visitors are not normally issued I-94 cards.