The five interlocking rings of the Olympic symbols are assumed to represent five continents: the Americas, Europe, Australia, Asia, and Africa. Meanwhile, the colors were decided by its creator, Pierre de Coubertin, in 1912. The colors supposedly represented the nations who were part of the Olympic games at that time.
However, Pierre did not want to combine the colors of the rings as he believed that the colors cannot truly represent each competing continent.
Yet, in this modern time, some people would argue that such principle does not apply anymore. For instance, some countries whose flags bear some of the colors indicated in the Olympic symbol are not really represented during the games. Thus, the interlocking feature of the rings and its colors cannot be considered an international symbol.
However, in the end, the Olympic symbol stands for the inspirations that led to the revival of the modern Olympic games.