In an autocracy, those in power are not accountable to the governed in any meaningful way. Autocrats can be hereditary monarchs, military rulers, single-party leaders or personal rulers. Many hold elections or keep a parliament, but these do not threaten their hold on power.
Political scientists distinguish between closed autocracies and “electoral” or hybrid regimes that hold managed elections. Autocracies are usually contrasted with democracies, where power is limited by competitive elections, independent courts and civil liberties. Where a country sits on this spectrum is measured by indexes such as V-Dem, Freedom House and the EIU Democracy Index.