If you are outside the US - nothing. If you are in the US football is a poor apology for rugby but you have to wear tons of body armour.
GOOGLE YOUR BEST FRIEND: INFORMATION FREELY AVAILABLE BY TYPING IN WHAT YOU WANT Association football, more commonly known as football or soccer, is a sport played between two teams of eleven players with a spherical ball. At the turn of the 21st century, the game was played by over 250 million players in over 200 countries, making it the world's most popular sport. The game is played on a rectangular field of grass or green artificial turf, with a goal in the middle of each of the short ends. The object of the game is to score by driving the ball into the opposing goal. In general play, the goalkeepers are the only players allowed to touch the ball with their hands or arms, while the field players typically use their feet to kick the ball into position, occasionally using their torso or head to intercept a ball in midair. The team that scores the most goals by the end of the match wins. If the score is tied at the end of the game, either a draw is declared or the game goes into extra time and/or a penalty shootout, depending on the format of the competition. The Laws of the Game were originally codified in England by the Football Association in 1863 and have evolved since then. Association football is governed internationally by FIFA, which organises the FIFA World Cup every four years. HOPE THIS HELPS CLEAR UP A FEW THINGS
Actually it's the same thing.. US people usually say it soccer but people outside US, just like european people, usually call it football