What type of clouds are described as layers that cover most of the sky?

Stratus clouds are characterized as low, gray layers that can cover much or all of the sky, often resembling a uniform blanket. These clouds form when a large air mass cools uniformly, leading to a stable atmosphere where the moisture condenses over a wide area. As a result, stratus clouds can lead to overcast conditions and are frequently associated with light precipitation, such as drizzle. Their formation process and appearance make them distinct from cumulus clouds, which are fluffy and often appear as isolated puffs, cirrus clouds, which are thin and wispy, and nimbus clouds, which indicate rain and can take different forms. Stratus clouds dominate the horizon with their extensive presence, making them the correct answer regarding clouds that cover most of the sky.