The rings on the Olympic flag represent the five continents that take part in every Olympic Games. The rings are interlocking because it symbolizes unity between all the countries taking part in the Olympic Games. The colors of the rings, blue, black, red, yellow and green, and also the white background come from all of the flags of the countries that took part when the flag was designed in 1912.
The Olympic flag was designed by Baron Pierre de Coubertin, the founder of the modern Olympic Games. He originally intended to propose the flag at the 1914 Olympic Congress, but the onset of World War I shelved his plans. Eventually, the Olympic flag was adopted and used for the first time at the 1920 Summer Olympics in Antwerp. The Olympic flag has been used in every Summer and Winter Olympic Games since.
Coubertin first came up with the idea of five interlocking rings for the Olympic flag when he was the president of the French delegation at the International Olympic Committee. It is thought that he took inspiration from Carl Jung, a Swiss psychiatrist who was of the view that a ring symbolized human unity, which was the main objective for Coubertin when he set up the modern Olympic Games.