The C-1 transit visa is a nonimmigrant visa which allows foreign nationals to enter into the U.S. while transiting to another foreign country.
Foreign nationals traveling through the U.S. to another foreign destination are eligible for C-1 visa.
Note: If you have C-1 transit visa you are required to leave the U.S. on your proposed departing flight. Your family members need to apply for a separate C-1 visa. This enables the entire family to travel through the U.S.