Oracle Cloud Infrastructure is hosted in regions and availability domains. A region is a localized geographic area, and an availability domain is one or more data centers located within a region. A region is composed of one or more availability domains. Regions are independent of other regions and can be separated by vast distances-across countries or even continents. Availability domains are isolated from each other, fault tolerant, and very unlikely to fail simultaneously. Because availability domains do not share infrastructure such as power or cooling, or the internal availability domain network, a failure at one availability domain within a region is unlikely to impact the availability of the others within the same region. Fault domain is a grouping of hardware and infrastructure within an availability domain. Each availability domain contains three fault domains. Fault domains provide anti-affinity: they let you distribute your instances so that the instances are not on the same physical hardware within a single availability domain. A hardware failure or Compute hardware maintenance event that affects one fault domain does not affect instances in other fault domains. In addition, the physical hardware in a fault domain has independent and redundant power supplies, which prevents a failure in the power supply hardware within one fault domain from affecting other fault domains.

What is Object Storage?
* All data, regardless of content type, is managed as objects
* Each object is stored in a bucket. A bucket is a logical container for storing objects
* Objects are stored in a single, flat structure without a folder hierarchy. This means that accessing individual objects is fast and easy
* Each Object is composed of object itself and metadata of the object. T his makes it easier to index and access data
* Object storage is quite common in cloud based storage scenarios with very high scalability and reliability
* While files and blocks are generally available to an operating system (by mount operation), object storage relies on standard HTTP verbs

Infrastructure as a service (IaaS) is a form of cloud computing that provides virtualized computing resources over the internet. IaaS is one of the three main categories of cloud computing services, alongside software as a service (SaaS) and platform as a service (PaaS). IaaS architecture and how it works In an IaaS model, a cloud provider hosts the infrastructure components traditionally present in an on-premises data center, including servers, storage and networking hardware, as well as the virtualization or hypervisor layer. Reference:
https://searchcloudcomputing.techtarget.com/definition/Infrastructure-as-a-Service-IaaS

Explanation
Oracle Compute Shape is coming with predefined or customize the number of OCPUs that are allocated to an instance. The amount of memory, network bandwidth, and number of VNICs scale proportionately with thenumber of OCPUs.