CDC: Abbreviated for Corporate Data Center. CDC is an institutional data center usally owned, operated and managed by Corporate bodies for their in house IT infrastructure needs. It could be in the shape of small server room or reasonably sized data centers in a corporate world.

IDC: Abbreviated for Internet Data Center. IDC is generally owned, operated and managed by an Internet Service Provider (ISP). Corporates generally host their internet based services in an IDC. IDC usually provides services like Cloudbased Hosting, E-Mail Hosting, Website Hosting, Colocation facilities etc. Cloudbased services are the latest buzz words in the managed hosting services