Introduce cloud technology

Cloud technology means moving your local computing and data to other servers over an Internet network. Investing huge infrastructure is very expensive unless you know your risk.

In general, cloud technology provides dynamic infrastructure, so your system does not need to stop if you want to upgrade your infrastructure. There are three terms in cloud technology: SaaS, PaaS and IaaS.

SaaS, or Software as a Service, is the most familiar form of cloud service for consumers. SaaS moves the task of managing software and its deployment to third-party services. Examples of SaaS include DropBox, Google Apps, and other storage solutions.

PaaS, or Platform as a Service, provides a platform on which software can be developed and deployed. Customers focus their business. They can select which platform fits on their business without thinking about network infrastructure and servers. Examples of PaaS include Heroku, Google App Engine, and Red Hat's OpenShift.

IaaS, or Infrastructure...