Power is a thing that cannot be bought at a store but is earned. Either by being born into it or obtaining it. Like a king for example he could be born into power or he can gain it by say killing the old king if he dose that he can gain the old kings power. A parent for example they have power over their children. They can tell them to clean their rooms and the kids have to listen to their parents. Or they will be in trouble either being grounded or slapped.