For a given temperature, the greater the dew point the greater the water content of the air.
Dew point temperature is defined as the temperature to which the air would have to cool in order to reach saturation (assuming constant air pressure and water vapor content).
When the dew point is equal to the air temperature then saturation is said to exist because the air is holding as much water vapour as possible.
Dew point temperature can never be greater than air temperature; therefore, if air cools, water must be removed from the air. This is accomplished through condensation.
Condensation results in the formation of tiny water droplets that can lead to the development of fog, frost, clouds, rain or snow.