Video game expansions are additional content released for a game after its initial launch. They often include new storylines, characters, levels, or gameplay features, enhancing the original experience. Expansions can be standalone or require the base game to play, and they are popular in various genres, including role-playing games and strategy games. These expansions are typically sold separately and can provide players with hours of new content. Examples include World of Warcraft expansions, which introduce new regions and quests, or The Sims expansion packs that add new gameplay mechanics and items.