AB型, or AB blood type, is one of the four main blood types in the ABO blood group system. It is characterized by the presence of both A and B antigens on the surface of red blood cells. Individuals with AB型 can receive blood from all other blood types, making them universal recipients. People with AB型 blood make up about 4% of the global population. This blood type is often associated with certain personality traits in popular culture, but scientifically, there is no evidence linking blood type to personality. Understanding blood types is crucial for safe blood transfusions and organ transplants.