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Human blood is made of the same substance, but classified into four different groups (A, B, AB, and O). Everyone belongs to a specific group of blood, which is further divided into 8 different blood types, e.g. A+, A-, B+, B-, AB+, AB-, O+ and O-. This division method is used to tell what specific type of blood you have and knowing your blood type can help you donate blood to save lives.