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i've heard platform as a service....all i know is things like Heroku, which hosts and deploys your apps.

how does PaaS development cycle differ from SaaS ?

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"Platform as a Service" (PaaS) is a subset of "Software as a Service" (SaaS). The main difference is that the software in PaaS is intended for other software developers / companies, not end users / private persons.

It mainly differs by platform stability being more desirable in PaaS; i.e. high uptime is expected, and API's should be more stable and backwards compatible and not introduce breaking changes without good reason.

Wikipedia has more information.

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The most well-known example of platform as a service is Force.com, which is offered by salesforce.

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