Plasma is the liquid portion that makes up more than half of your blood. Plasma donation is different from whole blood donation.Quoted From: https://www.grifolsplasma.com/en/importance-of-plasma/plasma-explained
"Plasma is more than just a component of blood - it"s the basis for some of the world"s most critical lifesaving medicines. The medicines developed from plasma can provide better treatment and improved quality of life for patients who need emergency or preventive medicine. Plasma medicines are used by patients with chronic, rare diseases including primary immunodeficiencies, bleeding disorders, or those dealing with conditions like hepatitis, animal bites, septic shock and liver disease."