Scientists tell us that the cloud is is a mixture of visible polymers floating in the air which is a small droplet of water vaporized in the atmosphere, or a small ice crystal formed by condensation.
Years ago, There appeared the computer and then the server (which is a very powerful computer), the server could count a difficult math problems in a short period of time, but the most intelligent person had to do it of his life. The scientists were very happy and command the server to calculate various puzzles, tricky problems, so, the server was too tired to collapse. It is estimated that scientists feel shy, they found a few servers to work together and the effect is very good. Thus scientists have found more puzzles & tricky problems, servers collapsed, so more servers are being used. Scientists enjoyed in this process and named it Distributed Computing and called servers Server Cluster.
Ordinary people worship scientists, ask for scientists: The server do the tired work, but after all, this is only one thing. We don't have such a rare problem, but we have a lot of tedious & repeated work. Can you help us solve it?
The scientists thought about it seriously. This is a very interesting question. The servers are doing puzzle things, But what ordinary people do every day is a trivial little thing and never ends. A server can only do a small part of a big event. It should be easy to do these small things?
Scientists have given it a better name: the Cloud.
The Cloud is composed of many small units originally.