How does cloud computing work?

Published in: http://www.thoughtsoncloud.com/

     
        The first building block is the infrastructure where the cloud will be implemented. Some people make the assumption that environment should be virtualized, but as cloud is a way to request resources in an on-demand way and if you have solutions to provide  on bare metal, then why not? The infrastructure will support the different types of cloud (IaaS, PaaS, SaaS, BPaaS).
       To be able to provide these services you will need Operating System Services (OSS), which will be in charge of deploying the requested service, and Business System Services (BSS), mainly used to validate the request and create the invoice for the requested services. Any metrics could be used to create the invoice (for example, number of users, number of CPUs, memory, usage hours/month). It is very flexible and depends on the service provider.

To read more go to: http://www.thoughtsoncloud.com/2014/02/how-does-cloud-computing-work/