Cloud Computing

 

What is cloud computing ?

Cloud computing is a style of computing in which dynamically scalable and oftenvirtualized resources are provided as a service over the Internet. Users need not have knowledge of, expertise in, or control over the technology infrastructure in the "cloud" that supports them.

Cloud computing services often provide common business applications online that are accessed from a web browser, while the software and data are stored on the servers.

The concept generally incorporates combinations of the following:

 infrastructure as a service (IaaS)

 platform as a service (PaaS)

 software as a service (SaaS)

Cloud computing customers do not generally own the physical infrastructure serving as host to the software platform in question. Instead, they avoid capital expenditure by renting usage from a third-party provider. They consume resources as a service and pay only for resources that they use.

A cloud application leverages the Cloud in software architecture, often eliminating the need to install and run the application on the customer's own computer, thus alleviating the burden of software maintenance, ongoing operation, and support. For example:

Peer-to-peer / volunteer computing (Bittorrent, BOINC Projects

Web application (Twitter)

Software as a service (Google Apps, SAP and Salesforce)

Software plus services (Microsoft Online Services)

The "big four" of cloud computing services are said to be Amazon, Google, Microsoft and Salesforce.com. Cloud computing is also being adopted by individual users through large enterprise customers including General Electric, Procter & Gamble and Valeo

Disadvantages

Because cloud computing does not allow users to physically possess the storage of their data (the exception being the possibility that data can be backed up to a user-owned storage device, such as a USB flash drive or hard disk), it does leave responsibility of data storage and control in the hands of the provider. Responsibility for backup data, disaster recovery and other static "snapshots" has been a long-standing concern for both outsourced as well as resident IT systems.

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