What are clouds made out of?
A cloud is a visible mass of droplets or frozen crystals suspended in the atmosphere above the surface of the Earth or another planetary body. A cloud is also a visible mass attracted by gravity, such as masses of material in space called interstellar clouds and nebulae. Clouds are studied in the nephology or cloud physics branch of meteorology. On Earth the condensing substance is typically water vapor, which forms small droplets or ice crystals, typically 0.01 mm in diameter. When surrounded by billions of other droplets or crystals they become visible as clouds. Dense deep clouds exhibit a high reflectance (70% to 95%) throughout the visible range of wavelengths. They thus appear white, at least from the top. Cloud droplets tend to scatter light efficiently, so that the intensity of the solar radiation decreases with depth into the gases, hence the gray or even sometimes dark appearance at the base. Thin clouds may appear to have acquired the color of their environment or background
The most common clouds that we would see would be made out of very small droplets of water. Other clouds could be made out of smoke or volcanic ash. Clouds can also be composed of liquids other than water. They answers that say water vapor are incorrect as water vapor is a gas, and you cannot see water when it is a gas. Water exists in three states, a vapor, a liquid, and a solid.
The clouds are formed by the condensed water vapor. The water vapor are those small droplets of water that eventually condensed on high altitude with lower temperature. In short changing the water vapor from gas state to liquid state which we call condensation. The clouds are not purely water. Some other gases, especially the greenhouse gases were mixed with the clouds which causes acid rain and greenhouse effect. Clouds are made up of condensed water vapor and different gases.