It's always interesting to me how rivals can become friends. I don't think it's unusual, especially when you have two rivals, or competitors, at the top of their game. They both share a passion for one specific thing, and even though they may be competing against each other, they have this shared interest that looms large between them.
Bill Gates and Steve Jobs certainly had that kind of rivalry, but they respected each other. Eventually that respect turned toward friendship. I think theirs is a good example of how different people can add a different element of friendship to your life.
Gates says of Jobs: "He and I, in a sense, grew up together." They were close in age and "kind of naively optimistic and built big companies."
They were very aware of each other, they competed in the business world, and were rivals. And yet, they obviously respected one another. Gates said "The world rarely sees someone who has had the profound impact Steve has had, the effects of which will be felt for many generations to come. I will miss Steve immensely."