SAAS, PAAS and IAAS : Three ways to Cloud Computing


There typically three ways to cloud computing. People often hear about these three (PAAS, SAAS, IAAS) terms in cloud computing. Lets discuss about these three terms here. Lets know what they are, what are their pros and cons.

Firstly, abbreviations

  1. SAAS : Software as-a service
  2. PAAS : Platform as-a service
  3. IAAS : Infrastructure as-a service

IaaS vs. PaaS vs. SaaS


  • All of them allow users to run applications and store data online
  • Each offers different level of user flexibility and control

IaaS vs. PaaS vs. SaaS 2


  • Software as-a service
  • Allow users to run existing online applications
  • Where off-the-shelf applications are accessed over the internet
  • Examples:

Pros and cons of SAAS

  • PROS
    • Free or paid via subscription
    • Accessible from any internet / computer
    • Facilitates collaborative working
  • CONS
    • Generic applications are not always suitable for business



  • Platform as-a service
  • Allows users to create their own cloud applications using supplier specific tools and languages
  • Provides environment and tools for creating new online applications
  • Examples:
    • Google API engine
    • Azure microsoft


  • PROS
    • Rapid development at low cost
    • Private or public deployment
  • CONS
    • Limited developer to provider language and tools (restricted technically )
    • Vendor locking (Risk of vendor lock-in)



  • Allows users to run any applications they please on cloud hardware of their own choice
  • Allows existing applications to be run on a cloud suppliers hardware
  • Virtualization


4 Different IAAS depending on type of there service

  1. IAAS: Private cloud
  2. IAAS: Dedicated hosting
  3. IAAS: Hybrid hosting
  4. IAAS: Cloud hosting

4.1 IAAS : Private Cloud

  • Secure and costly

IAAS private cloud

  • Specific number of physical server is dedicated to one customer

4.2 IAAS : Dedicated Hosting

  • Customer runs physical server on demand with cost and number of service all matching their requirement

IAAS Dedicated hosting

4.3 IAAS : Hybrid Hosting

  • Physical server and virtual server instances are rented on demand in an effort to reduce cost and further increase flexibility

IAAS Hybrid Hosting

4.4 IAAS : Cloud Hosting

  • Customer run Virtual server instance on demand often on hourly basis

IAAS Cloud hosting

IAAS example


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