Level of Detail (LOD) refers to the amount of detail and complexity in a model or representation of an object. In fields like computer graphics and architecture, LOD helps manage resources by adjusting the detail based on the viewer's distance or the importance of the object. For example, a 3D model of a building may have high detail when viewed up close but switch to a simpler version when viewed from afar. In video games, LOD is crucial for performance optimization. By using different levels of detail for objects, games can run smoothly without sacrificing visual quality. This technique allows for a more immersive experience while ensuring that the system's resources are used efficiently.