A cloudy region is an area of the SKY that is covered with clouds. It is usually associated with a certain type of weather, such as rain or snow. Clouds are formed when water vapor in the atmosphere condenses into tiny droplets or ice crystals. These droplets and crystals form a layer of clouds that can block out sunlight and cause the SKY to appear gray or white. The term 'SKY' is used to describe this type of cloudy region.