This document compares Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). IaaS provides virtualized computing resources for customers to deploy and run software. PaaS provides a computing platform and solution stack for customers' applications. SaaS provides applications to customers as a service on a subscription basis.

4. IaaS PaaS SaaS
(on-premise)
you manage
applications applications applications applications
data data data data
you manage
runtime runtime runtime runtime
operator manages
middleware middleware middleware middleware
you manage
operator manages
os os os os
virtualization virtualization virtualization virtualization
operator manages
servers servers servers servers
storage storage storage storage
networking networking networking networking

5. Iaas, PaaS, SaaS
Developing Apps on Windows Azure

17. Developing Apps on Windows Azure

20. Application
Running
Locally
Compute Emulator IIS
Storage Emulator SQL Server

22. http://myapp.cloudapp.net
Windows Azure
Portal
Package
http://1f53cab4a9e84792.myapp.cloudapp.net
Publish