You should know "CLOUD COMPUTING"

What is cloud computing?

1. It is a large group of interconnected computers.
2.  It is document centric, not PC centric. 

Basic types of cloud computing

 1) IaaS: Infrastructure as a Service 

 -provies offer of storage or serve usage

 -provides grids or clusters or virtualized servers, networks, storage and systems software

-vendor & its product: Amazon & Amazon EC2 (Elastic Compute Cloud)

2) PaaS: Platform as a service/ cloud OS 

-consists an operating system or a computer language

-vendor & its product: Google & Google App Engine

 3) SaaS: Software as a service 

-software: a customer can access online without having to download it

-the most widely known and widely used form of cloud computing 

-vendor and its product: Google & Google mail/docs or Skype

Advantages of using Cloud Computing 

• money-saving
• high performance
• low IT infrastructure costs
• fewer maintenance issues
• low software costs
• instant software updates
• increased computing power
• unlimited storage capacity
• increased data secuirity
• improved compatibility between OS
• improved compatibility in document formats

Disadvantages of using Cloud Computing

• easy group collaboration
• a constant and high-speed Internet connection required
• slow processing speed
• insecure data storage
• universal access to documents
• latest version availability
• lack of back-up function

 Issues concerning Cloud Computing

1) technical issues 

• Hundreds or thousands of individual computers or servers have to be purchased or otherwise commandeered, linked together, and managed. 
• In addition, feature-rich web-based software has to be developed, and served to users with 24/7 uptime.
•  All of this takes significant resources, which smaller companies might not possess.

2) business model issues

• How do companies make money offering cloud computing services?
• If a company can charge for its cloud services and storage, how should those services be priced? 

3) internet issues

• how secure is the cloud storage?
• If you save your web-based document in a cloud system, are you guaranteed that your document will still be there when you need it—and that it won’t be accessed by unauthorized users? 

 4) secuity issues

• Switching platforms is difficult at best, and if web-based applications aren’t fully compatible with existing file formats, the move to cloud computing simply won’t happen.

Applications of Cloud Computing 

• Apple's iCloud
• Facebook
• Skype
•  Twitter
• Google+
•  Amazon cloud player

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