1.On-Premises Data center?

*** A data center is a physical facility or building that houses a large group of networked computer servers, data storage drives, and networking equipment used to store, process, and share digital information that is called data center in cloud.****

2 cloud

Cloud computing means an organization uses IT resources provided by a cloud service provider, such as Oracle Cloud, instead of owning all the physical infrastructure.

The cloud provider manages the underlying physical data centers and hardware, while the organization manages the cloud resources it uses.