The AB blood type is one of the four main blood types in the ABO blood group system, which also includes A, B, and O. Individuals with AB blood type have both A and B antigens on the surface of their red blood cells, making them universal recipients for blood transfusions. This means they can receive blood from any ABO type without experiencing an immune reaction. People with AB blood type can have either Rh-positive or Rh-negative status, which further categorizes their blood type. The prevalence of AB blood type varies among different populations, with it being the rarest blood type globally. Understanding blood types is crucial for safe blood transfusions and organ transplants.