Also known as Form I-94, Arrival-Departure Record. The DHS, CBP official at the port-of-entry gives foreign visitors (all non-U. S. citizens) an Arrival-Departure Record, (a small white card) when they enter the U. S. Recorded on this card is the immigrant classification and the authorised period of stay in the U. S. This is either recorded as a date or the entry of D/S, meaning duration of status. It is important to keep this card safe because it shows the length of time you are permitted and authorised by the DHS to stay in the U. S. It is best kept stapled with your passport, kept in a safe place. The visitors return the I-94 card when they leave the country. The I-94W, Nonimmigrant Visa Waiver Arrival-Departure Record (green card) is for travellers on the Visa Waiver Program. Go to the DHS, CBP website to learn more.