The antagonist is a character or force in a story that opposes the protagonist, creating conflict. This opposition can take many forms, including a villain, a rival, or even an internal struggle within the protagonist. The antagonist's role is crucial in driving the plot and developing the protagonist's character. In literature and film, the antagonist often embodies traits that challenge the protagonist's goals or values. Examples of antagonists include Darth Vader from Star Wars and Iago from Othello. Their actions and motivations help to highlight the strengths and weaknesses of the protagonist, making the story more engaging.