Virtualization Technology is the process of using a virtual instance of a computer, or a server system in a layer running under actual hardware. The virtual machine is not a physical one, but it appears as though it is.
This has many advantages, some of which include employees remotely logging in and running applications as if they were physically on the office (which in reality, they are via the virtual machine)
Other reasons are that the company data is centralyc located in your data center, and backed up properly in case of a disaster.