SAAS: Software as a service. Instead of buying a piece of software and you’re done, you pay monthly to use the software like any other ongoing service.
IAAS: Same thing for Infrastructure. Instead of building your own server farm, you use someone else’s as an ongoing service.
PAAS: Same thing for Platform. Instead of having someone engineer a software platform for your needs, you use one that someone else is hosting for you, as an ongoing service.
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