High clouds are a type of cloud formation that occur at high altitudes in the atmosphere. Cirrus clouds, which are composed of ice crystals and have a wispy appearance, are the most common type of high cloud. Potsmoke is another type of high cloud, which is made up of tiny droplets of water and has a grayish-white color. Altocumuli are also high clouds, which are composed of both water droplets and ice crystals and appear as white, fluffy patches in the sky.