The ABO blood group system is a broad way of classifying blood into different types. Learning about the different blood groups and how to know your blood type is important for blood donation.

Humans inherit different traits and genes from their parents. Blood group is one of the things a person inherits from parents, and it cannot be changed after birth.

While everyone's blood is typically composed of the same basic parts, there are different blood types. It is important that you know your blood group type in order to determine the group you can donate blood to and the group you can receive blood from.

Since an individual's blood type depends on the genes inherited from parents, it causes a variation in blood composition between individuals.
Blood types are differentiated by differences in structure and antigen present on the surface of the red blood cells.

Even though there are up to 43 blood group systems recognized by the International Society of Blood Transfusion (ISBT), the two most important ones are the ABO blood group system and the Rh blood group system. This article will dwell on the former.

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https://www.semichealth.com/public-health/16/blood-group-types-abo-system