Answer:
In an autocracy the ruler doesn’t need the consent of the people to rule the country, whereas a President or a Head of state in a representative democracy would need to be elected;
An autocratic ruler can take whatever decisions they want; an elected president in a democracy can’t, they must abide by the Constitution;
Most democracies put a limit to the duration of a term for an elected official (e.g. 5 years for the president in France, 4 for this of the US, etc.), whilst in autocracies leaders can generally stay leaders for life;
Under a democracy, people are granted constitutional rights, which is not necessarily the case in an autocracy;
In an autocracy, there’s only one leader. That’s most often not the case in a democracy, which will generally have a Parliament.
