Democracy is a political system that entails a free and fair election open to all eligible citizens to take part in selecting their leaders. In other words, leaders are chosen by the people. Many of the most successful countries in the world operate under a democratic form of government.
One of the key advantages of a well-run democracy is that it prevents monopoly of authority. Due to the fact that the government is bound by an election term where parties compete to regain authority, democracy prevents monopoly of the ruling authority. And, the elected ruling party would make sure their policies will work for the people, as they will not be able to remain in power after their term with bad records — they will not be re-elected.