Virtualization allows multiple operating system instances to run concurrently on a single computer. It is the process of separating hardware from a single operating system. Each “guest” OS is managed by a Virtual Machine Monitor (VMM), which is also known as a hypervisor. Because the virtualization system sits between the guest and the hardware, it can control the guests’ use of CPU, memory, and storage, even allowing a guest OS to migrate from one machine to another.
Replication is the process of creating and managing duplicate versions of a database. Replication not only copies a database but also synchronizes a set of replicas so that changes made to one replica are reflected in all the others.
