You'll find four blood kinds: A, B, AB, or O. Also, blood is either Rh-good or Rh-unfavorable. So When you have type A blood, it's either A favourable or simply a detrimental. Which sort you might be is essential if you need a blood transfusion. And also your Rh https://www.youtube.com/watch?v=buIHtQY7fCU