This document provides an overview of cloud computing, including the different types (IaaS, PaaS, SaaS, etc.), how it works by hosting information on remote servers accessed over the internet, the benefits of scalability and reduced costs, and the risks around loss of control and dependency on cloud providers. It also discusses cloud clients, examples of cloud applications, and storage as a service.

2. CONTENTS
Introduction
Types of cloud computing
Cloud clients
Working of cloud computing
Benefits of Cloud Computing
Risks of Cloud Computing

3. Cloud computing is the use of computing resources
(hardware and software) that are delivered as a
service over a network (typically the Internet).
The name comes from the use of a cloud-shaped
symbol as an abstraction for the complex
infrastructure it contains in system diagrams.
Cloud computing entrusts remote services with a
user's data, software and computation.

4. Back

5. Types of Cloud
Computing
Infrastructure as a service (IaaS)
Platform as a service (PaaS)
Software as a service (SaaS)
Storage as a service (STaaS)
Security as a service (SECaaS)
Data as a service (DaaS)
Business process as a service (BPaaS)
Test environment as a service (TEaaS)
Desktop as a service (DaaS)
API as a service (APIaaS)

6. SaaS (Software As A
Service)
Is the most widely known and widely used form of cloud computing. It
provides all the functions of a sophisticated traditional application
to many customers and of ten thousands of users, but through a
Web browser, not a “locally -installed” application.
Little or no code is running on the Users local computer and the
applications are usually tailored to fulfill specific functions.
SaaS eliminates customer worries about application servers, storage,
application development and related, common concerns of it.
Examples are Salesforce.com, Google's Gmail and Apps, instant
messaging from AOL, Yahoo and Google, and VoIP from
Vonage and Skype.

8. PaaS (Platform as a
Service)
Delivers virtualized servers on which customers can run
existing applications or develop new ones without having to
worry about maintaining the operating systems, server hardware,
load balancing or computing capacity.
These vendors provide APIs or development platforms to
create and run applications in the cloud – e.g. using the
Internet. Managed Service providers with application
services provided to IT departments to monitor systems and
downstream applications such as virus scanning for e-mail are
frequently included in this category.
Well known providers would include Microsoft's Azure, Sales
force's Force.com, Google Maps, ADP Payroll processing,
and US Postal Service offerings.

10. IaaS (Infrastructure
as a Service)
Delivers utility computing capability, typically as raw virtual
servers, on demand that customers configure and manage. Here
Cloud Computing provides grids or clusters or virtualized servers,
networks, storage and systems software, usually (but not always) in
a multitenant architecture.
IaaS is designed to augment or replace the functions of an entire
data center. This saves cost (time and expense) of capital equipment
deployment but does not reduce cost of configuration,
integration or management and these tasks must be performed
remotely.
Vendors would include Amazon.com (Elastic Compute Cloud [EC2]
and Simple Storage), IBM and other traditional IT vendors.

12. STORAGE AS A
SERVICE(STAAS)
Storage as a service (STaaS) is a business model in
which a large service provider rents space in their
storage infrastructure on a subscription basis. The
economy of scale in the service provider's
infrastructure allows them to provide storage much
more cost effectively than most individuals or
corporations can provide their own storage,
when total cost of ownership is considered.
Storage as a Service is often used to solve offsite
backup challenges.

14. BUSINESS PROCESS AS A
SERVICE (BPAAS)
Business process as a service (BPaaS) pronounced [bē-păss] is
an application delivered as a service that is used by business
process service-provider personnel, who are performing activities
on behalf of the service recipient. It's a service that combines
the Business Process Outsourcing (BPO) with theSoftware as a
Service (SaaS) models. BPaaS is a model for businesses
outsource traditional business services. The difference with
BPaaS over BPO is that BPaaS emphases on the end results versus
operational activities. Where typical BPO programs will have the
client focusing on daily operational tasks to deliver the outcome,
BPaaS focuses on service level agreements (SLA) and Key
Performance Indicators (KPI) as the measure of operational
service and success.

16. TEST ENVIRONMENT AS A
SERVICE (TEAAS)
Test Environment as a service (TEaaS,
typically pronounced [teæs]), sometimes
referred to as "on-demand test environment,"
is a test environment delivery model in which
software and its
associated data are hosted centrally (typically
in the (Internet) cloud) and are typically
accessed by users using a thin client, normally
using a web browser over the Internet.

18. API AS A SERVICE(APLAAS)
API as a service is a service
platform that enables the creation
and hosting of APIs (application
programming interfaces).
These API's normally provide
multiple entry points for API calls
ranging from REST, XML web
services or TCP/IP.

19. Back

20. CLOUD CLIENTS
Users access cloud computing using networked client devices, such
as desktop computers, laptops, tablets and smartphones. Some of
these devices - cloud clients - rely on cloud computing for all or a
majority of their applications so as to be essentially useless without
it. Examples are thin clients and the browser-based Chromebook.
Many cloud applications do not require specific software on the
client and instead use a web browser to interact with the cloud
application. With Ajax and HTML5 these Web user interfaces can
achieve a similar or even better look and feel as native applications.
Some cloud applications, however, support specific client software
dedicated to these applications (e.g., virtual desktop clients and
most email clients). Some legacy applications (line of business
applications that until now have been prevalent in thin client
Windows computing) are delivered via a screen-sharing technology.

21. Back

22. HOW DOES CLOUD
COMPUTING WORK?
Cloud computer works by hosting your
information on computers „out there‟ „in
the cloud‟. The cloud is basically a batch
of computers called data centers or
servers that hold your information
(files,images,videos,etc) and can be
located anywhere. You‟re working in a
cloud because you don‟t have to store
software or files on your own computer.

23. SOME IMAGES OF WORKING
CLOUD COMPUTING
Back

24. BENEFITS OF CLOUD
COMPUTING
Cloud Computing brings with it many benefits to the end
user. These include:
Access to a huge range of applications without having
to download or install anything
Applications can be accessed from any computer,
anywhere in the world
Users can avoid expenditure on hardware and
software; only using what they need
Companies can share resources in one place
Consumption is billed as a utility with minimal upfront
costs
Scalability via on-demand resources

25. Back

26. RISKS OF CLOUD
COMPUTING
Cloud Computing has many benefits, however there are
also some associated risks with using cloud computing.
These include:
Users do not physically possess storage of their own
data, which leaves the responsibility and control of
data storage with the provider
Users could become dependent upon the cloud
computing provider
With data held externally, business continuity and
disaster recovery are in the hands of the provider
Data migration issues when changing cloud provider
What happens if your cloud provider goes out of
business?