Do not confuse with blood group O positive answer, we have provided the link below for better understanding.
People with O negative blood group are considered universal donors. RBC's which they contain do not have A, B, or Rh antigens.
People who have a blood group of AB positive are considered as a universal recipient. Those people who have AB positive blood group have an absence of antibodies to A, B, or Rh in their blood.
There are four major blood groups: A, B, O, and AB. Blood groups are classification as blood, they are classified on the presence and absence of antibodies and other antigens on the surface of Red blood cells.