Data centre

Data center is the foundation on which cloud computing is built and made operational. A data center is a physical set up consisting of buildings, servers, operating systems,and applications. These resources are offered as services to users over the Internet. Here is the wikipedia definition for data centre

"A data center (or data centre or datacentre) is a facility used to house computer systems and associated components, such as telecommunications and storage systems. It generally includes redundant or backup power supplies, redundant data communications connections, environmental controls (e.g., air conditioning, fire suppression) and security devices."

Datacenter is powered by virtualization technologies and as such support scalable demands.