The US C1 visa, also known as the Transit Visa, is a type of visa that allows individuals to transit through the US en route to another destination. This visa is intended for individuals who will be staying in the US only for a layover and do not have the intention of engaging in activities such as tourism or business. The C1 visa is typically valid for a shorter period of time than other types of visas, and the processing time for this visa is typically faster as a result. If you will be stopping in the US for a layover on your way to another destination, you may need to apply for a C1 visa in order to do so.
To apply for a US C1 Transit Visa-
The C1 visa is intended for transit purposes only and does not allow you to stay in the US for more than the designated time, travel or study in the US, work in the US, extend the C1 visa, adjust or change the status of the C1 visa, apply for a Green Card, or bring dependents with only one transit visa. Dependents are not allowed to travel, work, or study in the US on a C1 visa.
The C1 visa is valid for a maximum of 29 days or until the date of departure from the US on your ticket, whichever comes first.