AppFabric is Microsoft's brand for its [cloud computing][1] products. It is split into two divisions: Azure AppFabric and Windows Server AppFabric.

[Azure AppFabric][2]
[Azure][3] AppFabric runs 'in the cloud' - it provides services that are accessed over the Internet, including a Service Bus and an Access Control service.

[Windows Server AppFabric][4]
Windows Server AppFabric runs 'on premise' i.e. inside an organisation's firewall as opposed to on the Internet. Windows Server AppFabric provides services for hosting and managing [Workflow Foundation][5] components, and also provides a [memcached][6]-like distributed cache.

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