Cloud Computing is internet-based computing, whereby shared recources, software, and information are provided to computers and devices on demand. It is a paradigm shift following the shift from mainframe to client-server. Details are abstracted from the users, who no longer have need for expertise in, or control over, the technology infrastructure "in the cloud" that supports them.

The term "cloud" is used as a metaphor for the internet. Cloud computing providers deliver common business applications online that are accessed from another web services or software like a Web browser, while the software and data are stored on remote servers. Most cloud computing infrastructures consist of services delivered through common centers and built on servers. Clouds often appear as single points of access for all consumers' computing needs.

Cloud computing customers do not own the physical infrastructure, instead avoiding capital expenditures by renting usage from a third-party provider. They consume resources as a service and pay only for resources that they use.

The system architecture of a cloud computing platform resembles the Unix/Linux philosophy of having multiple programs each doing one thing well and working together over universal interfaces. Complexity is controlled and the resulting systems are more manageable than their monolithic counterparts.

No need to puchase expensive servers and network appliances. If using Open-source then there will be no third party licensing fees for database engines and operating system software. All the user need is an internet connectivity (DSL) capable of wi-fi and a network printing device. The user facility will not have to burden itself with complex IT issues, updates, and upgrades. Medical provider users will have more time for healthcare and this improves patient care.