What are the requirements for obtaining a postdoctoral visa in the United States?

To obtain a postdoctoral visa in the United States, you typically need to have a valid job offer from a research institution or university, hold a doctoral degree or equivalent, and demonstrate sufficient funding to support yourself during your stay. Additionally, you must meet any specific requirements set by the U.S. Citizenship and Immigration Services (USCIS) for the visa category you are applying for.