IaaS vs PaaS vs SaaS | Cloud Computing

What are IaaS, PaaS and SaaS

What are IaaS, PaaS and SaaS

Infrastructure as a Service (IaaS) 

  Provides virtualized computing resources over the internet. 

  Cloud provider manages IT infrastructures (storage, server and networking resources), and delivers them to customers via virtual machines accessible through the internet. 

  Building block for all services provided by Cloud Computing. 

 Examples of IaaS: 

• AWS Elastic Compute Cloud (EC2) 

• Azure VM 

• Google Compute Engine 

 Platform as a Service (PaaS) 

 Provides a platform allowing customers to develop, run, and manage applications without the complexity of building and maintaining the infrastructure. 

 Typically designed to support the complete web application lifecycle: building, testing, deploying, managing and updating. 

 Allows user to avoid the expense and complexity of buying and managing software licenses, the underlying application infrastructure and middleware. 

 You manage the applications and services you develop and the cloud service provider typically manages everything else. 

Examples of PaaS: 

• AWS Elastic Beanstalk 

• Google App Engine 

Software as a Service (SaaS) 

 Provides software delivery and licensing in which software is accessed online via a subscription, rather than bought and installed on individual computers. 

 Provides a complete software solution which you purchase on a pay-as-you-go basis from a cloud service provider. 

 All of the underlying infrastructure, middleware, app software and app data are located in the service provider’s data center. 

 SaaS platform helps IT professionals strategically manage and forecast IT costs 

Example of SaaS: 

• Gmail 

 • Office 365 

 • Google Docs

Resposibily Matrix: this matrix define who will do what