What is the role of an "antagonist" in a narrative?

In a narrative, the antagonist represents a character or force that is in direct conflict with the protagonist, creating tension and driving the story's plot. The protagonist is typically the main character whose journey or goal is central to the narrative, while the antagonist opposes that journey, whether through direct opposition, manipulation, or the introduction of obstacles. This conflict is essential for character development and can take many forms, such as a rival, a villain, or even societal norms and forces that challenge the protagonist. This tension is crucial for engaging the reader, as it sets the stage for growth, resolution, and thematic exploration within the story.