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The cloud is in essence an offsite server (generally in a data center) that provides services and information that are hosted remotely and delivered over the Internet. These services range from website hosting and email to VoIP telephone services, Videoconferencing, timekeeping, and recordkeeping.

Merriam-Webster Online Dictionary
cloud (noun)
a visible mass of particles of condensed vapor (as water or ice) suspended in the atmosphere of a planet (as the earth) or moon
something resembling or suggesting a cloud as
a) a light filmy, puffy, or billowy mass seeming to float in the air - a cloud of blond hair a ship under a cloud of sail
b) (1) a usually visible mass of minute particles suspended in the air or a gas
(2) an aggregation of usually obscuring matter especially in interstellar space
(3) an aggregate of charged particles (as electrons)
c) a great crowd or multitude - swarm clouds of mosquitoes
something that has a dark, lowering, or threatening aspect - clouds of war a cloud of suspicion
something that obscures or blemishes - a cloud of ambiguity
a dark or opaque vein or spot (as in marble or a precious stone)
cloud (verb)
intransitive verb
to grow - cloudy usually used with over or up clouded over before the storm
a) of facial features to become troubled, apprehensive, or distressed in appearance - her face clouded with worry
b) to become blurry, dubious, or ominous - often used with over the outlook is clouding over
transitive verb
to billow up in the form of a cloud
a) to envelop or hide with or as if with a cloud - smog clouded our view
b) to make opaque especially by condensation of moisture - steam clouded the windows
c) to make murky especially with smoke or mist - smoke clouded the sky
to make unclear or confused - cloud the issue
- taint sully a clouded reputation
to cast gloom over - cloud prospects for success
Cloud (Wikipedia)

Cumuliform cloudscape over Swifts Creek, Australia

In meteorology, a cloud is an aerosol consisting of a visible mass of minute liquid droplets, frozen crystals, or other particles suspended in the atmosphere of a planetary body or similar space. Water or various other chemicals may compose the droplets and crystals. On Earth, clouds are formed as a result of saturation of the air when it is cooled to its dew point, or when it gains sufficient moisture (usually in the form of water vapor) from an adjacent source to raise the dew point to the ambient temperature.

They are seen in the Earth's homosphere, which includes the troposphere, stratosphere, and mesosphere. Nephology is the science of clouds, which is undertaken in the cloud physics branch of meteorology. There are two methods of naming clouds in their respective layers of the homosphere, Latin and common.

Genus types in the troposphere, the atmospheric layer closest to Earth's surface, have Latin names due to the universal adoption of Luke Howard's nomenclature that was formally proposed in 1802. It became the basis of a modern international system that divides clouds into five physical forms which can be further divided or classified into altitude levels to derive ten basic genera. The main representative cloud types for each of these forms are stratus, cirrus, stratocumulus, cumulus, and cumulonimbus. Low-level clouds do not have any altitude-related prefixes. However mid-level stratiform and stratocumuliform types are given the prefix alto- while high-level varients of these same two forms carry the prefix cirro-. Genus types with sufficient vertical extent to occupy more than one level do not carry any altitude related prefixes. They are classified formally as low- or mid-level depending on the altitude at which each initially forms, and are also more informally characterized as multi-level or vertical. Most of the ten genera derived by this method of classification can be subdivided into species and further subdivided into varieties. Very low stratiform clouds that extend down to the Earth's surface are given the common names fog and mist, but have no Latin names.

In the stratosphere and mesosphere, clouds have common names for their main types. They may have the appearance of stratiform veils or sheets, cirriform wisps, or stratocumuliform bands or ripples. They are seen infrequently, mostly in the polar regions of Earth. Clouds have been observed in the atmospheres of other planets and moons in the Solar System and beyond. However, due to their different temperature characteristics, they are often composed of other substances such as methane, ammonia, and sulfuric acid, as well as water.

Tropospheric clouds can have a direct effect on climate change on Earth. They may reflect incoming rays from the sun which can contribute to a cooling effect where and when these clouds occur, or trap longer wave radiation that reflects back up from the Earth's surface which can cause a warming effect. The altitude, form, and thickness of the clouds are the main factors that affect the local heating or cooling of Earth and the atmosphere. Clouds that form above the troposphere are too scarce and too thin to have any influence on climate change.

The tabular overview that follows is very broad in scope. It draws from several methods of cloud classification, both formal and informal, used in different levels of the Earth's homosphere by a number of cited authorities. Despite some differences in nomenclature, the classification schemes seen in this article can be combined by using an informal cross-classification of physical forms and altitude levels to derive the 10 tropospheric genera, the fog and mist that forms at surface level, and several additional major types above the troposphere. The cumulus genus includes four species that indicate vertical size and structure which can affect both forms and levels. This table should not be seen as a strict or singular classification, but as an illustration of how various major cloud types are related to each other and defined through a full range of altitude levels from Earth's surface to the "edge of space".

Forms and levelsStratiform
mostly nonconvective
strong convective
Extreme-levelPMC: Noctilucent veilsNoctilucent billows or whirlsNoctilucent bands
Very high-levelNitric acid and water PSCCirriform nacreous PSCLenticular nacreous PSC
Low-levelStratusStratocumulusCumulus humilis or fractus
Multi-level or moderate verticalNimbostratusCumulus mediocris
Towering verticalCumulus congestusCumulonimbus
Surface-levelFog or mist
Time-lapse video of clouds at sunset in Japan
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