Why is the press called the lighthouse of democracy?

Press is actually media which spreads news to the larger public.they play a very important role in the aspect of democracy.The public have all the rights to know about the outside world based on legislature,executive and all aspects of government. This should be clearly understood.This important work is done by the press. They publish the news from all over the world to a small area in a village. therefore, the press is the lighthouse of democracy which guides people and spreads the news all over large public.