is condensation and dew drops the same
These water-drops are called dew. Quite often people think that dew drops, like rain-water, fall on the earth from sky during night but this is not true. Dew drops are formed due to condensation of water vapors. Air around us contains water vapors which we call moisture or humidity.
Fog develops when air having a relatively high humidity comes in contact with a colder surface, often the Earth's surface, and cools to the dew point. Additional cooling leads to condensation and the growth of low-level clouds. Fog that develops when warmer air moves over a colder surface is known as advective fog.