Definition
Virtualization is a technology that allows a single physical computer to act like multiple independent computers. It creates virtual versions of hardware, operating systems, storage devices, or network resources. This is achieved through a software layer called a hypervisor, which manages and allocates the physical resources to each virtual instance. Virtualization is crucial for efficient resource utilization, cost savings, and increased flexibility in IT operations. For example, a single server can host multiple virtual machines, each running a different operating system or application. This differs from simply running multiple applications on one OS, as virtualization isolates entire operating environments. Concepts related to virtualization are frequently tested in CompTIA Security+, Network+, and CySA+ certifications.