Some elements of football have been seen in many countries, dating back to the second and third century AD in China. The modern games of both rugby football and association football comes from 19th-century England. Kicking a ball goes back to the Middle Ages. Association football spread to many other parts of Europe, and was brought to the rest of the world with colonization. Today, it is the most popular sport in the world and many people watch it on television, especially the FIFA World Cup that happens every four years.