Blood type AB is one of the four main blood types in the ABO blood group system, characterized by the presence of both A and B antigens on the surface of red blood cells. Individuals with this blood type can receive blood from any ABO type, making them universal recipients. People with blood type AB can donate blood to other AB individuals but are not universal donors. This blood type is relatively rare, occurring in about 4% of the population. Understanding blood types is crucial for safe blood transfusions and organ transplants, as compatibility can prevent serious medical complications.