A Datacenter is space provided in a colocation building for servers and equipment that can directly connect to Internet network backbones. Datacenters are used by businesses to provide reliable, secure, redundant, Internet connectivity and space for websites, applications, and important data. Most datacenter colocation providers offer additional managed network service and onsite support for all aspects of WAN connectivity and security. Datacenter colocation space is sold by the rack or cage with additional options for power, cooling, and data back-up available. Datacenters are also known as Data Colocation, Data Center Colocation, Colocation Space, Colocation Server Hosting, Colocation Facility, or Colo Hosting.