If you ever visit the refrigerator lay and pick out a very chilled bottle of drink, leave it for a while and then return, you would notice that the bottle begins to shed drops around it.
sweating bottle
Sweating Bottle- Image Source: Google

In another case, if after a warm bath, you glance at the mirror to behold your beautiful face., leave the dressing room to look  more exotic and return to a second glance at the mirror, its surface becomes
unclear and while trying to clean, the hands get wet, then you have met condensation.

Condensation is the the process by which water vapor  in the air is changed into liquid water. In other words the warm air in the air were cooled by cold soft drink also the warm water vapor
from my body were cooled by the cold mirror surface.

This same phenomenon is the reason behind cloud formation.