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Read these definitions of computing models, then say

which one is Platform-as-a-Service,

Infrastructure-as-a-Service, Software-as-a-Service.

This refers to the fundamental building blocks of

computing that can be rented: physical or virtual

server

s, storage and

networking.

The next layer up -- as well as the underlying

storage, networking, and virtual servers this will also include the tools and

software that developers need to build

application

s on top of: that could

include middleware,

database

management, operating systems, and development

tools.

The delivery of applications-as-a-service, probably

the version of

cloud computing

that most people are used to. The underlying

hardware

and operating system is irrelevant to the end user, who will access

the service via a

web browser

or app; it is often bought on a per-seat or

per-user basis.

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