The C blood group is one of the lesser-known blood types within the Rh blood group system. It is characterized by the presence of the C antigen on the surface of red blood cells. Individuals with this blood group can have either C or c antigens, which are important for blood transfusions and organ transplants. People with the C blood group may face challenges in finding compatible blood donors, as this group is less common than the more prevalent types like A, B, AB, and O. Understanding blood group compatibility is crucial for safe medical procedures and emergency situations.