Definitions: There are three cloud deployment architectures or market segments when defining the opportunities and barriers to entry:
Software as a Service – SaaS – represented by distinct B2B applications like Salesforce.com and Google Apps, and B2C applications like Apple’s iCloud.
Platform as a Service – PaaS – represented by application platforms targeted at application developers and including Microsoft Azure and Amazon Beanstalk.
Infrastructure as a Service – IaaS – represented by on-demand access to low-level IT infrastructure such as virtualized computer, storage, and networking infrastructure.
The elephant in the room is that, relative to global IT spend, use of public cloud is in its infancy.
Adoption of the cloud varies by business size and IT structure.
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