Cloud Computing Concepts:
as a Service (SaaS) includes all the cloud services where consumer are able
to access software application over the internet. The applications are hosted
on the cloud and can be used for a wide range of tasks for both individuals and
This model enables to provide software
application as a service to the end users. It refers to a software that is
deployed on a hosted service and is accessible via Internet.
Twitter, Facebook and Flickr are all examples of SaaS, with users able to
access the services via any internet enabled device.
Enterprise users are able to use applications for
a range of needs, including accounting and invoicing,
tracking sales, planning, performance monitoring and communications
(including webmail and instant messaging).
SaaS is often
referred to as software-on-demand
and utilizing it is akin to renting
software rather than buying it
software applications you would purchase the software upfront as a package and
then install it onto your computer. The software’s license may also limit the
number of users and/or devices where the software can be deployed.
Software as a Service users, however, subscribe to the software rather
than purchase it, usually on a monthly basis. Applications are purchased and
used online with files saved in the cloud rather than on individual computers.
Features and benefits of SaaS
Pay for what you use:
if a piece of software is only needed for a limited period then it is only paid
for over that period and subscriptions can usually be halted at any time.
Updates are automated:
whenever there is an update it is available online to existing customers, often
free of charge. No new software will be required as it often is with other
types of applications and the updates will usually be deployed automatically by
the cloud provider.
hardware costs: the processing power required to run the applications is
supplied by the cloud provider.
No initial setup costs:
applications are ready to use once the user subscribes.
Usage is scalable:
if a user decides they need more storage or additional services, for example,
then they can access these on demand without needing to install new software or
Accessible from any
location: rather than being restricted to installations on individual
computers, an application can be accessed from anywhere with an internet
Applications can be
customized and white labelled: with some software, customization is
available meaning it can be altered to suit the needs and branding of a particular
compatibility: SaaS applications can be accessed via any internet enabled
device, which makes it ideal for those who use a number of different devices,
such as internet enabled phones and tablets, and those who don’t always use the
Here are the characteristics of SaaS service model:
SaaS makes the software available over the
The Software are maintained by the vendor rather
than where they are running.
The license to the software may be subscription
based or usage based. And it is billed on recurring basis.
SaaS applications are cost effective since they
do not require any maintenance at end user side.
They are available on demand.
They can be scaled up or down on demand.
They are automatically upgraded and updated.
SaaS offers share data model. Therefore,
multiple users can share single instance of infrastructure. It is not required
to hard code the functionality for individual users.
All users are running same version of the
Browser based risks
Lack of portability between SaaS clouds