Why dews are formed in clear night but not in cloudy night?

Dew forms on clear nights because the ground loses heat through radiation, causing temperatures to drop. As the temperature falls, moisture in the air condenses on surfaces when they cool below the dew point. Conversely, on cloudy nights, clouds act as an insulating layer, trapping heat and preventing the ground from cooling sufficiently for dew to form. This is why dew is more likely to occur on clear nights compared to cloudy ones.