Distributed computing on internet Or delivery of computing
service over the internet.
Instead of keeping data on your own hard drive you use a
service over the Internet, at another location, to store your
information or use its applications.
Cloud services are popular because they can reduce the
cost and complexity of owning and operating computers
Cloud benefits to users include scalability, reliability, and
"cloud computing" gradually evolved in 1950’s when large-scale
mainframes were made available .
The real implementation of virtual machines came in the 70s
when IBM released an operating system called VM.
In the 1990s, telecommunications companies began offering
virtual private network (VPN) services with comparable quality
of service, but at a lower cost.
Public clouds are owned and operated by third
parties, they deliver superior economies of scale
to customers, as the infrastructure costs are
spread among a mix of users, giving each
individual client an attractive low-cost, “Pay-as-you-
go” model. y third parties; they deliver
superior economies of scale.
Private clouds are built exclusively for a single
They aim to address concerns on data security
and offer greater control, which is typically
lacking in a public cloud.
Hybrid Clouds combine both public and private cloud
With a Hybrid Cloud, service providers can utilize 3rd
party Cloud Providers in a full or partial manner thus
increasing the flexibility of computing.
The Hybrid cloud environment is capable of providing
on-demand, externally provisioned scale
Cloud Computing Services
SaaS (Software as a service): Required
software, Operating system & network is
PaaS (Platform as service): Operating system
and network is provided.
IaaS (Infrastructure as a service): just Network
Saas (Software As a Service )
We can access this cloud hosted application
without any additional hardware or software.
E.g. : G-mail, Yahoo mail, Hotmail etc.,
Paas (Platform As a Service )
Give us nice API (Application Programming
Interface) and take care of the implementation.
It is a platform for developers to write and create
their own SaaS. i.e. applications.
Iaas (Infrastucture As a Service )
It is also known as hardware as a service.
Iaas is a computing power that you can rent for a
limited period of time.
allows existing applications to be run on a cloud
Bandwidth could bust your budget
App performance could suffer
Data might not be cloud-worthy
Too big to scale
Cloud Computing is the fastest growing part of IT.
Tremendous benefits to customers of all sizes
Cloud services are simpler to acquire and scale
up or down
Public clouds work great for some but not for all
Private clouds offer many benefits for internal
Public and private clouds can be used in
Real Time Application
Made up of millions of servers, which stores
amounts of data.
Amazon’s Elastic Compute Cloud-Amazon
It provides resizable computing capacity on cloud,
Developer’s only pay for capacity they use.
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