Surfing is a water sport where surfer is riding on the forward or deep face of the moving wave. The wave is usually carrying the surfer towards the shore. Those are usually ocean waves, but surfers can ride also on lakes and rivers. They can ride an artificial waves, such as those from boat wakes, and the waves created in artificial wave pools too.
The sport of surfing began between the 19th and 20th centuries, but wave riding is an old practice that has its origins in the ancient Polynesian and ancient Peruvian cultures.
The modern surfing was born on the Hawaiian island of Oahu, Duke Kahanamoku is considered as the father of modern surfing. He is the one who popularized the ancient Hawaiian sport.