The "sport of kings" is of ancient origin. For thousands of years horses have raced in England, on the European continent, in ancient Mongolia and in the Middle East. Regardless of its origin, horseracing has flourished in the United States for a couple of centuries. What has made it such a popular activity? It is an exciting and multi-faceted sport with its own language, culture and actors. Here are a few details to help you get into what is truly a complex subject.