I’m planning to travel to the United States, but I’m not sure which type of visa I need based on the nature of my trip. Is there a difference between a tourist visa, a business visa, and a student visa? What if I want to attend a conference, visit family, or explore universities — does that affect the visa category? Could you explain how I can determine the appropriate visa type and what the application process looks like? Are there special programs like ESTA or visa waiver options available for certain nationalities?