Virtualization: This is the process of using software to stimulate a computer or some other devices.
GRID; op 1 systeem meerdere surfers.
Grid – network gebruikt als computer. With three types Often combinations (hybrid):   
- Software as a Service
- Infrastructure as a Service
- Platform as a Service – machine die je zelf inricht als een server.

- Flexibility and cost
- No software to install or upgrade to maintain
- Available from any computer that has access to the Internet
- Can scale to a large number of users easily
- New applications can be up and running very quickly
- Services can be leased for a limited time on an as-needed basis    
Economic perspective – lower entry barriers, scalability, Innovation

- Your information is stored on someone else’s computer - how safe is it?
- You must have Internet access to use it. If you do not have access, you’re out of luck
- You are relying on a third-party to provide these services