An "enemy" is typically defined as a person or group that opposes or is hostile towards another. This opposition can manifest in various forms, such as conflict, competition, or rivalry. Enemies can arise in personal relationships, political situations, or even in sports, where teams compete against each other. In literature and media, enemies often serve as antagonists, creating tension and conflict in a story. They can represent challenges that protagonists must overcome, making the narrative more engaging. Examples of famous enemies include Sherlock Holmes and Professor Moriarty, or Harry Potter and Lord Voldemort.