The AB blood group is one of the four main blood types in the ABO blood group system, which also includes A, B, and O. Individuals with the 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 blood type without experiencing an immune reaction. People with the AB blood group can donate blood to other AB individuals but can only receive blood from A, B, AB, and O blood types. This unique combination of antigens allows for greater flexibility in blood transfusions, but it is essential for blood banks to carefully match donors and recipients to ensure safety and compatibility.