A cloud forest or fog forest is a (usually) tropical or subtropical, contains mostly evergreen trees, and is high up on a mountain. There is a large amount of water in the air. Cloud forests have cloud cover for much of the year, usually at the same height as the canopy, the place where the trees' branches meet.
Cloud forests grow from 500 to 4000 meters above sea level. Usually, they grow where the fog is right at the level where the plants grow, so there is less sunlight to burn away the mist. Many of the plants take water through fog drip. Fog drip is when water forms drops on tree leaves and then drips onto the ground below.