Blood donation refers to the voluntary process of collecting blood and blood components from donors to help people who need transfusions. The purpose is to ensure an adequate blood supply for accident victims, surgery patients, and those with diseases. Blood donation has a long history dating back to ancient times, but modern blood banking began in the 1930s with the establishment of blood banks. Today there are over 2535 licensed blood banks in India that help collect and distribute over 26 million units of blood annually to those in need.