Blood donation is the process where a person voluntarily gives their blood to be used for medical purposes. This blood can be used for patients undergoing surgery, those with chronic illnesses, or victims of accidents. Donors typically undergo a simple screening process to ensure their health and safety. The donated blood is collected in a sterile bag and tested for various diseases before being stored. It can be separated into components like red blood cells, plasma, and platelets, each serving different medical needs. Blood donation is a crucial part of healthcare, helping to save lives and improve patient outcomes.