Explanation: The essential difference is that the democratic government is elected by the citizens, it is mostly an indirect so-called representative democracy. In such a state the government is in the service of the citizens and through the government the will of the citizens is expressed, individualism, the right to freedom and property are emphasised. Citizens in a regular election can change the government, so it is changeable and expresses the will of the people.
In an authoritarian state, the so-called government is subordinate to an authority that governs, abolish democratic rights, elections are conducted, but one knows roughly who will win, such elections serve to say that they are conducted and nothing more. This authority is one ruler with absolute authority, a dictator, and he subordinates all forms of government to himself. So it is a centralised government, usually assisted by a militia or army, and all other institutions that are supposed to work for the good of the people are abolished or have a parade role.