Circular Reasoning

A circular argument restates the conclusion instead of proving and supporting the main argument; thus, this type of argument is named the circular argument. In clarification, the argument uses the conclusion as the main idea of the argument to prove that the argument is justifiable, which leads to the opponent  not having any room for argument because the first argumentor concluded the argument. 
An example of a circular argument is a conversation with a friend, “Hey do you think I am right?” says friend. “No you aren’t right.  I am right because I am right”. (As one may see, the main point of the speaker's argument was the support and defensive). 
On Seinfeld, the main character Elaine utilizes a circular fallacy when she says, “Oh no my old number is 626, but now it’s also my new number, so technically it’s my old number” (Seinfeld). Elaine the protagonist, utilizes her support, to her being right, to win the argument. Thus, this leaves no room for the opponent to argue back.