Water Vapor
What happens when you drive through fog or mist?  Your windshield gets wet.
What happens when you're hiking in the mountains, and a cloud blows over you?  You get wet.
When it's a really humid day in Florida, is your vision blocked?  No, generally the air is perfectly clear.

Water vapor is a GAS.  Individual molecules, and you can't see them.  On the other hand, clouds, mist, and fog are LIQUID water, very small droplets, but liquid nonetheless.
  Most clouds are water droplets (liquid)
If you can SEE it, it CANNOT be a gas (vapor).  What we normally call "humidity" is gaseous water, or water vapor.  It is invisible.

The only exceptions to clouds being liquid water are very high clouds in very cold air.  Cirrus clouds, for instance, the high, wispy clouds you see on nice days, are so high that the water is frozen into very small (dust size) crystals.  But that's a solid, so it's still not vapor.
Cirrus Clouds  Cirrus Clouds - ice crystals

This also brings up an important issue: "Steam".  Look at the images below of a teapot boiling.
Photo of boiling teapotA cloud of white "steam" is visible coming from the teapot's spout. But there is a gap between the cloud and the spout.
When you boil water in a teapot such as the one above, you get a visible cloud of what we usually call "steam" coming out of the spout.  But when you pass your hand through that cloud, it gets wet, doesn't it?  So that's not water vapor, it's liquid water droplets.  Not particularly hot, because it's already condensed.  Effectively, it's a small, artificial cloud.

On the other hand, that little gap between the steam cloud and the spout of the teapot?  Do not EVER put yourself into that gap.  The reason is that in that gap, true steam is present - actual, gaseous water vapor.  It is often called "live steam".  The problem is that if you stick your finger (for example) there, your finger is so much colder than the steam that you'll immediately get condensation of water.  And for every gram of water that condenses on your finger, 540 calories (the Heat of Vaporization) will be absorbed by your skin - and you'll immediately receive a very bad burn.

In the early days of the Industrial Revolution, steam boilers sometimes catastrophically ruptured.  Many people were killed, some certainly from the impact of the explosion, but many because of being enveloped by live steam which condensed on them, with the result that they received 2nd and 3rd degree burns over most of their bodies.  You don't survive that kind of injury.

So what do we see when we look at clouds?