Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. João Paulo Lopes Caetano, known as João Paulo (born 4 June 1984 in Portimão, Algarve) is a Portuguese footballer, who plays as a left winger. Association football, 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.