Governments are a group of people who run a country, state or city. The government keeps order in that country and has a police force to keep that order. They make laws that the citizens must follow and if they do not then there is a justice system that may fine them, take them to court and they're guilty, take them to jail. There are many types of governments around the world and they lead their country in many different ways. Democracy and communism are just two of many governments that are controlling countries right now.
All governments have a philosophy which is what they believe in and how they aim to control their citizens. Democracy and Communism both aim for equality. Communism aims for equality in economy