Government power comes from the people - democracy. The word democracy comes from the Greek <em>dēmokratía</em>, with <em>dêmos</em> meaning "people" and <em>krátos </em>meaning "power."
Citizens do not have the power to vote - autocracy. In many autocracies nowadays, citizens do vote in elections, but they are not entirely free to choose who will be elected because autocrats around the world have developed ways to rig the voting process (for example, by registering votes under the names of deceased citizens). This has been observed in Thailand, Kenya, and Uganda for example.
Government power is controlled by one person - autocracy. An autocracy is a form of government where the power is concentrated in the hands of a single person.
Citizens choose government leaders in elections - democracy. A democracy establishes the principle that since the power belongs to the people, citizens are in charge of electing (or removing) their leaders through the vote.
