Antagonist
The antagonist is what goes against the main character of the story. The prefix ant- means against. The antagonist causes the main conflict in the story. The main conflict can be external (outside of the character). For example, when two characters go against each other, or the main character needs to survive in a harsh climate. The conflict can also be internal - within the main character's head. Often this internal conflict is caused due to a difficult decision the character must make.
