Serves as a leader: what he says, people will follow. Hence why it’s ludicrous for him to suggest ingesting disinfectant.
Commander in chief: Leads the strategy in military
Appoint ambassadors and chairs of cabinets and departments
Influences policy making by using veto power.
Can initiate trade.
Etc.
In elitist theory power is seen as concentrated amongst a few groups or individuals, including the government. Elitist theory would suggest that only a few major pressure/interest groups, such as the NRA or AARP, actually have any influence, and that even they struggle to gain power because it is concentrated in the hands of a few members of government.
Democracy is a system of government where the citizens exercise power by voting. In a direct democracy, the citizens as a whole form a governing body and vote directly on each issue. In a representative democracy the citizens elect representatives from among themselves.
It was the Founding Father Thomas Jefferson who included the idea of natural rights when he wrote the Declaration of Independence, since he wanted to make it clear why exactly the colonies were breaking ties with Britain.