The I-94 is a form used by the United States government to track the arrival and departure of non-U.S. citizens. It is typically issued to foreign visitors entering the country, providing important information about their immigration status and the duration of their stay. Travelers can obtain their I-94 at ports of entry, such as airports or land borders. The form includes details like the visitor's name, passport number, and the date they entered the U.S. It is essential for visitors to keep their I-94 safe, as it may be required for various purposes, including applying for a visa extension or changing their immigration status.