How does a communist system of government differ from a democracy?

Most of the time communism is dominated by a single party, and the ideal democracy has many- or non at all. Think of politics as a number line, left goes toward communism, and right goes towards fascism, and in the middle is democracy, in a democracy, the government shouldn't play an extreme roll in your life, but in a communism, it controls everything, from a humble farm, all the way to literally anything. It makes life easy, but really its a dream that can't really happen. There are many differences between communism and a democracy. 

The government of a communist system controls their people's jobs, housing, and wealth. They get there job picked for them by the government. As for a democracy the PEOPLE choose for themselves on their jobs, education, housing, and wealth. theses are some of the big differences.