*World Blood Donor Day* , observed annually on 14th June, marks the birth anniversary of Karl Landsteiner, who discovered blood groups. Initiated by the WHO, it promotes voluntary, unpaid blood donation to ensure a safe and sufficient blood supply. The day highlights the importance of regular donation, especially for emergencies, surgeries, and maternal care. It also encourages youth involvement, busts myths, and promotes community participation. In India, awareness campaigns and blood camps are organized nationwide. It reflects themes like public health, SDG-3, and citizen participation in healthcare strengthening. #essay #gs3 #healthcare #contentenrishment