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 PaaS (Platform as a Service)—An integrated platform for the development, deployment,
testing and support of web applications. It is presented as a service on the basis of the
concept of cloud hosting.
 SaaS (Software as a Service)—The business model of software licence which involves
development and support of the software vendor. Customers also have the opportunity of
paid use of it, usually through the internet. End-

Value Visibility to End-users Paas Application
Saas
users

Developers
laaS
Network
Architects
Fig. 12.14: Implementation of Cloud Computing

 DaaS (Desktop as a Service)—Another business model licence, this software, first
introduced in the early 2000s, is a slightly improved model of SaaS. It mostly involves use
of multiple services at the same time necessary to complete a work.
In addition to the above, within the concept of cloud hosting technology, there are also
common notion Data as a Service and Everything as a Service, respectively. Both concepts
show that through the World Wide Web using Cloud Hosting, any requirement can be met
in the processing of information. This is the main advantage of cloud computing hosting
in the IT-based business solutions.
CTM: Cloud computing refers to having access to all your applications and data from any network
device.

12.6 GRID COMPUTING
Database
Grid Computing can be defined as a network
of computers working together to perform a
task that would be rather difficult for a single Supercomputer
machine. All machines on that network work
Grid
under the same protocol to act like a virtual
Computing
supercomputer. The task that they work on may
include analyzing huge datasets or simulating
Emerging Trends
situations which require high computing power.
Computers on the network contribute resources
like processing power and storage capacity to the Laptop PCs
network. Fig. 12.15: Grid Computing Framework
Grid Computing is a subset of distributed computing, where a virtual supercomputer consists of
machines on a network connected by some bus, mostly Ethernet, or sometimes the internet. It
can also be seen as a form of Parallel Computing where, instead of many CPU cores on a single
machine, it contains multiple cores spread across various locations.

12.11