What is Iaas, PaaS and SaaS?

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What is the meaning of the following terms:-
IaaS
PaaS
SaaS
Can someone explain it in brief?
Jan 15 in AWS by Anjali
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IaaS, PaaS and SaaS are cloud computing service models.

  • IaaS (Infrastructure as a Service), as the name suggests, provides you the computing infrastructure, physical or (quite often) virtual machines and other resources like virtual-machine disk image library, block and file-based storage, firewalls, load balancers, IP addresses, virtual local area networks etc.

    Examples: Amazon EC2, Windows Azure, Rackspace, Google Compute Engine.

  • PaaS (Platform as a Service), as the name suggests, provides you computing platforms which typically includes operating system, programming language execution environment, database, web server etc.

    Examples: AWS Elastic Beanstalk, Windows Azure, Heroku, Force.com, Google App Engine, Apache Stratos.

  • While in SaaS (Software as a Service) model you are provided with access to application software often referred to as "on-demand software". You don't have to worry about the installation, setup and running of the application. Service provider will do that for you. You just have to pay and use it through some client.

    Examples: Google Apps, Microsoft Office 365.

answered Jan 15 by Deeksha

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