You have heard alot about Clouds, now Amazon has what they call their Virtual Private Cloud. You can obtain a private piece of the Amazon Web Services (AWS) Cloud. It is a virtual network you define. You can have all the benefits of the latest cloud technology and let someone else, Amazon, deal with the technology of keeping it running. The benefit is that you can have the same type of network you would run in your own data center. Using the VPC you can leverage the AWS cloud as an extension of your corporate data center, as just one of many options.
Learn more about the Amazon Virtual Private Cloud here.