Cloud computing is a model that enables network access to configurable computing resources like servers, storage, networks, and applications that can be rapidly provisioned with minimal management effort. Individual users connect to cloud services from personal devices over the internet without seeing the underlying hardware. There are three main service models - Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS) - as well as four deployment models ranging from private to public clouds. The cloud provides advantages like lower costs, universal access, and automatic updates but also risks like security issues and loss of control.

2. What is Cloud Computing
 Cloud computing is a model for enabling network access to a
shared pool of configurable computing resources (e.g.,
networks, servers, storage, applications, and services).
 When you store your photos online, use webmail or a social
networking site, you are using a “cloud computing” service.
 It can be rapidly supplied and released with minimal
management effort.
 It has some essential service models, and deployment
models.

3. Cloud Architecture
Individual users connect to cloud from
their own personal computers and portable
device, over the Internet. To these individual
users, the cloud is seen as a single application
,device or software. The hardware in the cloud
and the operating system that manages the
hardware connections is invisible.

4. Service Models
1. Software as a service (SaaS)
> The capability provided to the consumer is to use the provider’s
applications running on a cloud infrastructure.
> The applications are accessible from various client devices such as
a web browser (e.g., web-based email).
> The consumer does not manage or control the underlying cloud
infrastructure including network, servers, operating systems,
storage.
Examples: Caspio, Google Apps, Salesforce, Nivio, Learn.com.

5. Service Models (Cont’d)
2. Platform as a service (PaaS)
> The capability provided to the consumer is to acquired
applications created using programming languages and tools
supported by the provider.
> The consumer does not manage or control the underlying cloud
infrastructure.
> Consumer has control over the deployed applications and possibly
application hosting environment configurations.
Examples: Windows Azure, Google App.

6. Service Models (Cont’d)
3. Infrastructure as a service (IaaS)
> The capability provided to the consumer is to provision
processing, storage, networks, and other fundamental computing
resources.
> The consumer is able to deploy and run arbitrary software, which
can include operating systems and applications.
> The consumer does not manage or control the underlying cloud
infrastructure but has control over operating systems, storage,
deployed applications, and possibly limited control of select
networking components (e.g., host firewalls).
Examples: Windows Azure, Google App.

7. Service Models (Cont’d)

8. Deployment Models
The cloud is operated solely for an organization. It may be managed by the organization
or a third party and may exist on premise or off premise.
The cloud infrastructure is made available to the general public or a large industry group
and it is owned by an organization selling cloud services.
The cloud infrastructure is shared by several organizations and supports a specific
community that has shared concerns. It may be managed by the organizations or a third
party and may exist on premise or off premise
The cloud infrastructure is a composition of two or more clouds (private, community, or
public).

9. Deployment Models (cont’d)

10. Why the Cloud
Advantages:
• Can be less expensive compared to
software and hardware.
• Can be used from any computer or
with an Internet connection.
• The device does not need as large of an
internal storage system.
• Compatible with most computers and
operating systems.
• Provides dependable and secure data
storage center.
• Updates occur across the service.
Disadvantages:
• Security Issues
• Terms of Service
• Privacy Policies