Game add-ons are additional content or features that enhance a video game after its initial release. They can include new levels, characters, storylines, or gameplay mechanics, allowing players to expand their gaming experience. Add-ons can be purchased or downloaded for free, depending on the game and its developer. These expansions are often created by the original developers or third-party creators and can significantly increase the game's replay value. Popular examples of game add-ons include DLC (downloadable content), expansion packs, and mods, which can introduce new elements or modify existing ones to keep the game fresh and engaging.