“SaaS” : Software-as-a-Service |
Pre-configured applications offered as a service or utility over the Internet
Examples: Salesforce.com, Workday |
“PaaS” Platform-as-a-Service |
Higher-level development platform – APIs, runtimes and frameworks – offered as a service or utility over the Internet Examples: Google App Engine, Windows Azure |
“IaaS” Infrastructure-as-a-Service |
IT infrastructure – processing, storage and networking – offered as a service or utility over the Internet Examples: Amazon Web Services, Rackspace |