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A blood type (also called a blood group) is a classification of blood based on the presence or absence of inherited antigenic substances on the surface of red blood cells (RBCs). These antigens may be proteins, carbohydrates, glycoproteins, or glycolipids, depending on the blood group system. Blood group O (or blood group zero in some countries) individuals do not have either A or B antigens on the surface of their RBCs, and their blood serum contains IgM anti-A and anti-B antibodies against the A and B blood group antigens.
The genotype of blood type A is AA or AO. The antigens on the blood cell are A and antibodies in the blood plasma are B. For blood type B, the genotype is BB or BO with B as the antigens and B as antibodies. The blood type AB (also known as universal blood recipients and rarest blood type) has the genotype to be AB.