Cloud computing services are generally divided into three categories 1. Infrastructure
Provides virtual server instances with unique IP address and blocks of storage on demand, customers use the providers application program interface (API) to start, stop, access and configure their virtual services and storage. in the enterprise, cloud computing allows a company to pay for only as much as capacity as is needed.
Platform (as a service)
This is defined as a set of softwares and product development tools hosted on the providers infrastructure. developers create applications on the providers platform over the internet. Google Apps is an example of platform (as a service)
Here, the vendor supplies the hardware infrastructure, the software interacts with the user through the front end portal this for of cloud computing is a very broad market.services can be fro web based email to inventory control and database controlling