Virtualization has taken our server infrastructure over for good. When you need a new server instance you do not run to the store to get a new computer to host the server at. You create a new Virtual Machine on your Hyper-visor. It might sound very confusing and complicated at times but we can make it all manageable and at your control.
When you look at any computer and its workload it actually works in burst, and stays idling for much of its lifespan. Virtualization changes this. You can utilize much more of your processing power and save on energy and hardware costs.
Just a few well known manufacturers of virtualization software
How does this work ? We take a Server and instead of installing an operating system directly on it let say Windows Server 2016 of Centos 7, we install a Hyper-visor. This acts as the operating system and builds a foundation for us to crate many Virtual Machines ( Computers ) on this one physical computer. Resources of this hardware are divided between all the VMs (Virtual Machines) created on it. So if you need a new SQL server for example you just go to your Hyper-visor dashboard and create a new VM.