It is a set of extensions to the Windows OS aimed at making it easier for developers to build faster, scalable, and more-easily managed services.
It provides a distributed in-memory caching service and replication technology that helps developers improve the speed and availability of .NET Web applications and WCF services.
If you are hosting WCF services by using IIS or WAS in a production environment, you might want to consider implementing Windows Server AppFabric.
You can use use AppFabric in place of Memcached because AppFabric provides more feature than Memcached
Source: MSDN | |