The document defines and describes the 10 major types of clouds, including cirrus, cirrocumulus, cumulonimbus, altocumulus, altostratus, cumulus, stratus, stratocumulus, cirro, and nimbostratus. Each cloud type is given a brief description of its appearance such as thin and wispy, small and puffy, or tall and fluffy. Latin and Greek roots are also provided to explain the meaning behind parts of cloud names.