US-VISIT is a “check-in/check-out system” which collects biographic information and biometric identifiers on all foreign nationals entering the U.S. US-VISIT entry procedures are currently in place at U.S. airports and seaports with international arrivals and in the secondary inspection areas of U.S. land border ports of entry.
Upon arrival or departure at a port-of-entry where US-VISIT is in place, you are required to comply with the procedures. Procedures involve photographing and digital fingerprinting. Your information will be stored and checked against various national security and law enforcement databases.
For more information, refer to US-VISIT on the U.S. Department of Homeland Security web site.