Types of Cloud Computing's Clouds

1. Public Clouds: Service Provider owned and managed Access Over Web typically by per-per-use.

2. Private Clouds: Privately owned and managed with restricted Access (but could be hosted externally).

3. Hybrid Clouds: Interoperable combination of public and private clouds.

There are 3 cloud service types, namely:
SaaS: Software-As-A-Service (Applications, Processes, Information/Knowledge as a service)
PaaS: Platform-As-A-Service (virtualised optimised middlewares such as Operating systems, etc, etc)

IaaS: Infrastructure-As-A-Service (virtualised servers, storage and networks, etc).