From Longman Dictionary of Contemporary Englisha window on/to the worlda window on/to the worldsomething that makes it possible to see and learn about what is happening in other parts of the world Television provides us with a useful window on the world. → window
Examples from the Corpus
a window on/to the world• The news is also terrific for giving the boys a window on the world.• Million views Television is a window on the world with a difference.• Television is a window to the world. 