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By: Rashida Jamil 

Definition of Cloud Computing:

  • In layman’s terms, Cloud Computing is the storing and accessing of data and programs over the internet instead of your computer’s hard drive.

Key Characteristics:


  • Think of a room full of servers. Together, they become a massive pool of resources. Then think of the pool as multiple virtual servers and you just created a “cloud.”

Flexible and Scalable

  • Since virtual servers aren’t physical, they are super flexible, giving you what you need at the moment. Spin up a server in minutes, and take it down just as easily

Open or closed

  • In the open cloud, you can easily move your cloud around—without being locked into one provider or a closed network.


  • You’ll get the greatest cost savings in the public cloud, where your virtual servers run on physical servers that you share with other customers.


  • A hybrid cloud gives you the benefits of both public and private clouds. For example, you can put public-facing components in a public cloud, while storing customer-sensitive data in a private cloud.

Cloud Computing Services:

Software as Service (SaaS)

  • Is a Cloud-based application where you can access from someone else’s computer/domain. For Example: Gmail
    • You can sign up and start using cloud apps in minutes
    • Apps and data are accessible from any connected computer
    • No data is lost if your computer breaks, as data is in the cloud

Platform as a Service (PaaS)

  • Is a Cloud-based environment with everything required to support the complete lifecycle of building and delivering web-based or cloud applications.  This will cut down the cost and complexity of buying and managing the hardware, software, provisioning and hosting it
  • With PaaS you can:
    • Develop applications and get to market faster
    • Deploy new web applications to the cloud in minutes
    • Reduce complexity with middleware as a service

Infrastructure as Service (IaaS)

  • service that provides companies with computing resources including servers, networking, storage, and data center space on a pay-per-use basis.
    • On demand and elastic services—quickly scale up or down
    • Self-service, automated provisioning and de-provisioning
    • Reduced costs from economies of scale and resource pooling
    • Pay-for-use—costs based on metered service usage

Cloud Computing Deployment Models:

Public Cloud

  • Are owned and operated by companies that use them to offer rapid access to affordable computing resources to other organizations or individuals.
  • With public cloud services, you don’t need to purchase hardware, software or supporting infrastructure, which is owned and managed by providers.

Private Cloud

  • Is owned and operated by a single company that controls the way virtualized resources and automated services are customized and used by various lines of businesses. ——–Mainly used for internal use within a corporation.

Hybrid Cloud

  • Uses a private cloud foundation combined with the strategic use of public cloud services. ——The Hybrid cloud is on the public cloud but you can store personal things on the private cloud.

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