Electoral fraud, sometimes referred to as election fraud, election manipulation or vote rigging, is illegal interference with the process of an election, either by increasing the vote share of the favored candidate, depressing the vote share of the rival candidates, or both. What exactly constitutes electoral fraud varies from country to country. Many kinds of election fraud are outlawed in electoral legislations, but others are in violation of general laws, such as those banning assault, harassment or libel. Although technically the term "electoral fraud" covers only those acts which are illegal, the term is sometimes used to describe acts which are legal, but considered morally unacceptable, outside the spirit of an election or in violation of the principles of democracy. Show elections, containing only one candidate, are sometimes classified as electoral fraud, although they may comply with the law and are presented more as referendums. In national elections, successful electoral fraud can have the effect of a coup d'état or corruption of democracy. In a narrow election, a small amount of fraud may be enough to change the result. Even if the outcome is not affected, the revelation of fraud can reduce voters' confidence in democracy.