Blood type 'O' is said to be the universal donor. It can be transfused to people with all blood types because red blood cells have glycoprotein antigens on their surfaces. Type 'A' antigents, type 'B' has 'B' antigents, type 'AB' has both, and type 'O' has neither. There are also antibodies in our blood, but there are in the plasma -- not red cells. these protect the body from attack from germs. So the antibody in type 'A' blood will attack cells with the 'B' antigen while the antibody in type 'B' blood will attack cells with the 'A' antigen. Type 'O' has no antigens so it can be given to any person.
has neither