By John Brandon

Everyone’s talking about cloud computing. But what is it, who’s competing for it, and what will it mean for everyday users?

Cloud computing is set to take over the world, or at least possibly replace Microsoft Outlook. The cloud concept is simple: It’s a way to access your data and apps from anywhere, via the Internet (or “the cloud”). Yet everyone from Gartner Group to Google has a slightly different take on cloud computing: It can be anything from storing and sharing documents on Google Docs to running your entire company operations using a remote, third-party data center. Some envision it as a way to compute without operating systems, or pesky local client programs, and with minimal hardware needs (just a basic client machine).

“The most important single characteristic of a cloud is …

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