Soccer, also known as Football in some countries, is the world most popular sport. In 21st Century, there is an estimated of 250 millions football players and more than 1.3 billions people interested in Soccer. In 1863, Soccer was invented in London, England. Soccer is a two team game which consists of 11 players on each team. One of most important rules of Soccer is using any body parts except hands and arms; however, only the goalkeeper is allowed to touch the balls with their hands or arms. There are 21 professional soccer league all around the world. Soccer contains different types of offensive and defensive tactics to protect aganist the opponents.