A transit visa is a type of travel authorization that enables you to travel via another nation before arriving at your final destination. A transit visa for the Schengen Area is necessary, for instance, if you are flying from India to the US but need to stop in the Schengen Zone before continuing to the US.
Since transit visas are temporary and typically not necessary for everyone, it is crucial to check with an embassy or consulate before your trip to determine your eligibility.
When you are applying for a USA Transit visa you have to submit the following documents:
USA- Transit visa Eligibility