These are built, owned, and operated by companies and are optimized for their end users. Most often they are housed on the corporate campus.
Colocation data centers
In colocation (“colo”) data centers, a company rents space within a data center owned by others and located off company premises. The colocation data center hosts the infrastructure: building, cooling, bandwidth, security, etc., while the company provides and manages the components, including servers, storage, and firewalls.
Cloud data centers
In this off-premises form of data center, data and applications are hosted by a cloud services provider such as Amazon Web Services (AWS), Microsoft (Azure), or IBM Cloud or other public cloud provider.