The document provides an overview of cloud computing, defining it as a network-based computing paradigm that leverages internet infrastructure to provide integrated services. It discusses the three primary approaches to cloud computing: Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS), with a focus on the critical role of virtualization in enhancing scalability and efficiency. The conclusion emphasizes the future importance of cloud computing regarding cost, performance, data security, and service agreements.

1. Cloud Computing
Fares Jemni
Ali Ben Messaoud

2. Plan
• Introduction
• What is Cloud Computing ?
• Cloud Computing Approaches
• Key Technology: Virtualization
• Conclusion

3. Introduction
• Cloud Computing is a new and exciting trend which many of
us, even in the information technology field are, let’s say, a
“little cloudy about”.
• What is cloud computing?
• Are there different levels or types of cloud computing?
• Who exactly are these cloud computing providers?

4. What is Cloud Computing?
• Cloud Computing is a general term used to describe a
new class of network based computing that takes
place over the Internet,
• a collection/group of integrated and networked hardware,
software and Internet infrastructure
• provides hardware, software and networking services to
clients
• These platforms (networked hardware) hide the
complexity to provide a very simple service

5. What is Cloud Computing?
• Anything outside of your system’s firewall and
includes a pay-per-use or subscription service that
extends your agencies information technology
through the internet as the primary access point.

7. Basic Cloud Characteristics
• “no-need-to-know”
• details of infrastructure, applications interface with the
infrastructure via the APIs.
• “flexibility and elasticity”
• scale up and down allocated resource
• “pay as much as used and needed”
• “always on!, anywhere and any place”

8. 3 Approaches to Cloud Computing
• Software as a service (SaaS) :
• access to software and its functions remotely through internet
browsers.
• Platform as a service (PaaS) :
• computing platform is being delivered as a service, eg. purchase
and manage hardware remotely.
• Infrastructure as a service (IaaS) :
• defined as computer infrastructure, such as virtualization, being
delivered as a service.
• billed on usage and how much of the resource is used in data
centers for example.

9. XaaS

11. Key Technology: Virtualization
• The ability to run multiple version of something, such as a
hardware platform, operating system, a storage device or
network resources on a single physical system and share the
underlying hardware resources.
• cloud computing is famous for scalability because of
virtualization.
• Without virtualization, cloud computing as we know it would
not exist or would be in a different form.

12. Virtualize for Efficiency, Higher
Availability, and Lower Costs
• Run multiple operating systems and applications on a single
computer
• Consolidate hardware to get vastly higher productivity from
fewer servers
• Save 50% or more on overall IT costs
• Speed and simplify IT management, maintenance, and the
deployment of new applications

13. Virtualization How it Works?

14. Virtualization+Cloud

15. Conclusion
• Cloud computing is the future.
• Cost
• Performance
• Data and Security
• Support
• Service Level Agreements