"The American Dream."
It's one of those things that isn't easily explained. This isn't because it is a complex set of ideas that only super educated mathematicians can understand. It's more because The American Dream is subjective. If you asked 100 random people on the street you might get 100 completely different answers. That's the beautiful part of my American Dream.
I didn't know what I wanted to do when I was a kid. Even after I grew up I wasn't sure. It took me quite some time to find the "design and build" aspect of the Internet. Once I found that I had my American Dream to chase down, building websites for a living. It's more fulfilling than anything else I've ever done professionally. The best part is that every time I create another website for someone it may be helping that person get closer to their American Dream.