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SaaS – software as a service
largest cloud market / applications delivered through the internet / manged by a 3rd party vendor
examples – Salesforce, Google Apps, Office365

PaaS – platform as a service
used for software development / ability to develop, run, and manage apps without complexity of building & maintaining infrastructure
examples – Appear IQ, Amazon Web Services (AWS) Elastic Beanstalk, Google App Engine, and Heroku

IaaS – infrastructure as a service
outsourcing of equipment used to support operations -storage, hardware, servers and networking components / users responsible for managing / providers still manage virtualization, servers, hard drives, storage, and networking
examples  – Amazon Web Services (AWS) and Microsoft Azure