Ans:The EB-1 visa is a first-preference immigrant visa for extraordinary talents, outstanding professionals, and senior managers. It is divided into three categories: *EB-1A: Alien of Extraordinary Ability, no employer sponsorship required, based on individual achievements. *EB-1B: Outstanding Professor or Researcher, requires employer support. *EB-1C: Multinational Manager or Executive, requires transfer within the same company.