This document provides an overview of cloud computing. It defines cloud computing as accessing computing resources from an online cloud rather than a local device. The document outlines various cloud computing service models including software as a service, platform as a service, and infrastructure as a service. It also discusses the characteristics, economics, types, advantages, and disadvantages of cloud computing. The key benefits are lower costs, faster deployment of resources, and increased reliability through scalability and updates from the cloud.

1. CLOUD COMPUTING
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Md.Shamim Hossain
ID: 153015013
Green University of Bangladesh

2. Introduction:
Cloud computing is where computing resources
are accessed from a virtual online cloud rather
than a local desktop or organizational data centre.
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3. Contents
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 Definition
 Objectives
 Service models
 Characteristics
 Economics Layers
 Types of cloud computing
 Advantages and Disadvantages
 Conclusion

4. Definition
What is Cloud Computing:
Cloud Computing is the use of hardware and
software to deliver a service over a network
With cloud computing, users can access files
and use applications from any device that can
access the Internet.
An example of a Cloud Computing provider is
Google's Gmail.
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Service models
Software as a service (SaaS)
Platform as a service (PaaS)
Infrastructure as a service (IaaS)

7. Characteristics
Characteristics
Virtually
assemble
Pay-per-use
On-demand
self service
Offsite
technology
Shared
workloads
Massive
scale
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8. Economics
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9. Companies are looking for new ways to:
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Reduce costs
• Pay for only what
we use
• Reduce hardware
investment
• Reduce software
licenses
• Lower labor and IT
support costs
• Lower outside
maintenance cost
Faster time to
value
• Quickly take
advantage of
latest
technologies
• Simplify updating
and upgrading
• Increase speed of
deployment
• Scale IT resources
to meet business
needs
Increase reliability
• Improve system
reliability
• Improve system
availability

10. Layers of the cloud
Client
Application
Platform
Infrastructure
Server
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11. Types of cloud computing:
Simplest form
Types of cloud
computing
More complex
form
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12. Simplest form
Search engines
Webmail

13. More complex form
1. Web–based office application.
 Online photo and document sharing
Eg: ZOHO Work Online, Live Mesh
2. Branded, Domain-wide web service.
 Hosted spam filtering
Eg: postini, Google apps, Microsoft Office Live Beta
3. Large-scale web-based storage and computing power for
building your own application.
Eg: Amazon web services, Google app Engine
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14. Advantages and disadvantages
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• Lower software cost
• Improve performance
• Fewer maintenance issue
• Instant software updates
• Increased data safety
Advantages
• Requires a constant internet
connections
• Doesn’t not work well in low
speed connections
• May be slow
• Limited features
Disadvantages

15. Conclusions
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down by delivering appropriate resources only for
the time those resources are needed.
Cloud computing has enabled teams and
organizations to streamline lengthy procurement
processes.
Cloud computing increases profitability by
improving resource utilization. Costs are driven

16. Any Question?
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