"Rh Positive" refers to the presence of the Rhesus factor, a specific protein found on the surface of red blood cells. If a person has this protein, they are classified as Rh positive, while those without it are Rh negative. This classification is important in blood transfusions and pregnancy, as mismatched Rh types can lead to complications. The Rh factor is inherited from parents, and about 85% of people of European descent are Rh positive. Knowing one's Rh status is crucial for medical procedures, as it helps ensure compatibility and reduces the risk of adverse reactions during blood transfusions or childbirth.