What is an AssetBundle used for in Unity?

An AssetBundle in Unity is specifically designed as a collection of assets packaged together to facilitate efficient deployment and management of game resources. This allows developers to load and unload assets dynamically at runtime, which is especially useful for managing memory and improving performance in games. By using AssetBundles, developers can also decouple asset management from the main game build, enabling them to download or update assets independently without needing to distribute the entire game again.

This functionality is crucial for games that require large amounts of data or dynamic content updates, such as downloadable content (DLC), expanding a game's lifespan and enhancing user experience. The other choices do not accurately describe the function of an AssetBundle and focus on different aspects of game development, like character design or coding tools, which are separate from asset packaging and deployment in Unity.