Three categories of Cloud Computing?

I need more clarity on the three categories of Cloud Computing - IaaS, PaaS and SaaS. What purpose do these serve? As a user, do i have the option of using only one service amongst the three or do they always come together? How do these three differ from the three layers of Cloud Computing - Application, Platform and Infrastructure? Again, can I avail of just one?|||IaaS. Infrastructure as a Service. PaaS. Platform as a Service. SaaS. Software as a Service. SaaS. Software as a Service|||SaaS is Software as a service . As the name indicates software is provided as a service .ex a music player is in remote server and you can listen a music file in that player.





PaaS is Platform as a service. It provides a platform as a service . Suppose i hav a java file bt dont hav a JDE. i can run my java file in this service since a platform is provided via cloud.





IaaS-Infrastructure as a service.it provides a whole infrastructure which includes software,storage,platform etc ex any mail servers (where client app , storage etc are provided)





hav a luk at it :


http://en.wikipedia.org/wiki/Cloud_compu鈥?/a>|||google Cloud Computing