WHAT IS CLOUD COMPUTING
cloud computing has led to a ‘marketing fog’, and this is no better illustrated than with the multitude of definitions for the term.
I considered a number of well-known definitions of cloud computing, but I have chosen the NIST (National Institute of Standards and Technology) draft definition as my preferred definition because it is publicly available, it reflects the IT market and it is relatively simple, in my opinion. Quoting from draft number 15 (Mell and Grance, 2009):
Cloud computing is a model for enabling convenient, on-demand network access to a shared pool of
configurable computing resources (eg networks,servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction.
WHAT IS CLOUD COMPUTING?
This cloud model promotes availability and is composed of five essential characteristics, three service models, and four deployment models.
The NIST draft definition goes on to describe these five essential characteristics (on-demand self-service, broad network access, resource pooling, rapid elasticity and measured service), three service models (Software as a Service – SaaS, Platform as a Service – PaaS and Infrastructure as a Service – IaaS), and four deploymentmodels (Private, Community, Public and Hybrid Cloud);
but this chapter provides alternative descriptions.
Now, some industry experts do not like the use of the SaaS, PaaS and IaaS acronyms, but they are so firmly
embedded in the cloud computing literature that they cannot be ignored .
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