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This allows users to run software applications and store, edit and retrieve data over the internet from large networks of remote web servers rather than on users’ own computers. [1]

The cloud refers to remotely-hosted data centres or web servers. [2]

Rather than relying on computer products from corporate servers or desktop PCs, applications and services created in this new "cloud" are delivered over the internet and often accessed through a simple web browser, e.g., google docs. [3]

Online cloud computing offers cheaper services. [4]

Also, services depend on a fast broadband connection and a fast, efficient and secure browser. [5]

Example
If you have a Hotmail, Yahoo or Gmail e-mail account you are already using one type of cloud computing service. Similarly, social networking services such as Facebook and online photo sharing services such as Flickr rely on so-called Web 2.0 technology and cloud computing.  [6]

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10 innovations that will reshape business
Cloud control