There are actually 4 blood sorts: A, B, AB, or O. Also, blood is both Rh-beneficial or Rh-detrimental. So if you have type A blood, it's possibly A beneficial or A unfavorable. Which kind that you are is significant if you want a blood transfusion. And also your Rh https://www.youtube.com/watch?v=buIHtQY7fCU