Distinguish between Dew and Dew Point.

     Dew

  Dew point

Dew is a form of condensation. When an unsaturated and cool air comes in the contact with solid cold surface, specially in winter, moisture gets condensed on the cold objects such as roofs, rocks, plants, grasses in term of minute water drops. It is termed as dew.
It is common feature during winter in Northern Indian plains.

Dew point is the temperature at which a given sample of air becomes saturated.
Dew point leads or promotes condensation or makes air saturated.