The concept of virtual machines

"Virtual machine" (VM) is an IT term referring either to simulated system software or a simulated runtime environment for programs within a computer." (Wikipedia)

• using VMware means using the market leader in virtual machines
  
• exchangeability of program parts
  
• shortest possible down times in the event of hardware off time
  
• no installation of computers, operating systems and software necessary
  
• simple fall-back strategy using snapshots (points of data recovery)
• delivery of ready-to-use computer systems
  
• independent of operation system