The dew point is the temperature at which air must be cooled for it to become completely saturated with water vapor, leading to the formation of dew or condensation. When air cools to this temperature, it can no longer hold all the moisture, and water starts to condense out as liquid. This temperature indicates the actual moisture content in the air. If the air temperature drops below the dew point, dew forms on surfaces. When this dew point is below freezing, it's called the frost point, leading to frost instead of dew. Dew point is a better indicator of humidity than relative humidity because it represents the absolute moisture level in the air, which remains constant regardless of temperature changes. It also helps predict weather phenomena like dew, frost, fog, rain, and storms, and it significantly impacts human comfort by indicating how humid or dry the air feels. Higher dew points mean more moisture and a muggier feeling, while lower dew points indicate drier, more comfortable air.