Condensation is when water vapor (like a steamy shower!) turns into liquid water (ex. a foggy bathroom mirror). The reason this happens, is because the water molecules get energy removed from them, so they slow down, and tend to clump together, because water really likes being by other water molecules.

So you can imagine, if you add heat energy to water by putting a pot on the stove to boil, the water molecules take that heat energy and start moving faster and faster, until they are moving so fast that they escape the pot and go into the air. That's called vaporization!

Now you see, the process of condensation is just the reverse of the process of vaporization. Condensation is when molecules lose energy and turn from gas to liquid, and vaporization is when molecules gain energy and turn from liquid to gas!

Thanks for the question!