What is transit visa?
Some countries require people from certain nationalities that are traveling to a different destination other than their country, but with a stop in an airport in their soil, to obtain a transit visa. Usually is not hard to get them because you don’t need to prove much other than having a clean background. U.S.A. used to have this type before 9/11 but now it is required to have a valid tourist visa, or a visa waiver for qualified countries to enter to american Soil even if you are just changing planes.