Virtualization is the creation of a virtual version of something, such as an operating system, a server, a storage device, or a network resource. It involves the abstraction of physical computing resources, such as CPU, memory, storage, and networking, into virtual entities that can be accessed and managed by software.

Virtualization enables multiple operating systems or applications to run on a single physical machine, making more efficient use of resources and reducing costs. It also allows for the creation of isolated virtual environments that can be used for testing, development, or security purposes.

There are several types of virtualization, including server virtualization, desktop virtualization, application virtualization, storage virtualization, and network virtualization. Each type has its own benefits and use cases, but they all share the goal of improving resource utilization, increasing flexibility, and simplifying management.