Three Building Blocks of Cloud Computing

IT professionals have identified three underlying services as the building blocks of cloud computing.


SaaS

Allows users to run existing online applications means it allows users to use a complete application which runs on someone else’s system. SaaS users can be benefited from free use of application or paying only for the subscription, collaborative working and accessing from any computer.
Google, Microsoft, Zoho can be identified as the well-known SaaS providers.


PaaS

Allows users to create their own cloud applications by using provider specific languages and tools and run them on systems software and hardware provided by another company. PaaS users can be benefited from rapid development at low cost and selection of private or public deployment.
Google App engine, Microsoft Azure, Salseforce – Force.com can be identified as the well-known PaaS providers.


IaaS

Allows users to run any application they pleased on cloud hardware such servers or storage of their choice. There are four cloud hardware option users can choose.

• Private Cloud – in private cloud specific number of physical servers are dedicated to one customer.
• Dedicated Hosting – in dedicated hosting customers rent physical servers on demand with the cost of number of servers matching requirements.
• Hybrid Hosting – it is a mix of physical servers and virtual server instances. They are rented on demand in order to reduce cost and further increase flexibility.
• Cloud Hosting – where customers run virtual server instances on demand.

Amazon, Rackspace can be identified as the well-known IaaS providers.