Who is Hassan in The Kite Runner?

Hassan is a critical figure in The Kite Runner.  A poor boy, he is the best kite runner in Kabul, Afghanistan, and has grown up with the story’s wealthy protagonist, Amir.  Hassan and Amir are best friends despite the fact that Hassan is Amir’s servant.  The relationships between these two are key threads of the story’s plot.  One betrays the other, and we also learn that they are related by blood.  I won’t spoil the story by telling you how.  I do hope you will actually read this book, as it is wonderful!!