Service Models
NIST describes three service models:
- Cloud Software as a Service;
- Cloud Platform as a Service; and
- Cloud Infrastructure as a Service.
The differentiators among these three service models are the nature of the service and the level of customer-vendor control and engagement. Furthermore, it should be noted that these models are not mutually exclusive; organizations can and do employ different cloud service models on varying scales for different departments within the organization based on specific needs.
Source: Technet.com
Cloud software as a service (SaaS): The vendor provides, manages and controls the underlying cloud infrastructure, including individual applications, network, storage, servers, operating systems, etc. The customer is able to fully access the vendor’s applications in the cloud via a variety of devices (e.g. cell phone, laptop, PDA). SaaS examples include MyErp.com, Salesforce.com and Workday.com. Google Docs, Twitter and Facebook also fall into this category.
Cloud platform as a service (PaaS): Similar to SaaS, the vendor provides, manages and controls the cloud infrastructure, except for applications, which the customer has control over. The vendor provides tools and resources allowing the customers to create and/or acquire applications to meet their specific needs. PaaS vendor examples include Wolf Frameworks, Dell-Boomi Atmosphere, Heroku, Google App Engine and Microsoft’s Azure
Cloud infrastructure as a service (IaaS): The vendor provides, manages and controls the general cloud infrastructure but provides the customer control over operating systems, storage, processing, and networks on demand. IaaS vendor examples include Flexiant’s Flexscale, Rackspace and Amazon’s Elastic Cloud Compute (EC2) and their Simple Storage Service (S3).
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