The cloud, is an expression used to describe a
variety of different types of computing concepts
that involve a large number
of computers connected through a real-time
communication network (typically the Internet).
What is cloud
– designing, developing and building hardware and
– processing, structuring, and
– managing various kinds of information
by doing scientific research on and with
computers; and creating and using
communications and entertainment media.
What is computing
• Cloud Computing means a type of Internet-based
computing, where different services such as servers, storage
and applications are delivered to an organization's devices
through the Internet.
• It’s a collection of networked hardware, software and
• Shared pool of configurable computing resources
• On-demand network access
• Provisioned by the Service Provider
• Remotely hosted
• Low Cost Software
• On Demand Self-Service
• Resilient Computing
• Pay as much as you use
Software as a Service
• SaaS uses the Web to deliver applications that are
managed by a third-party vendor and whose interface is
accessed on the clients’ side.
• Most SaaS applications can be run directly from a Web
browser, without any downloads or installations
• Gmail is one famous example of an SaaS mail provider.
Platform as a Service
• Developers gain with PaaS is a framework they can build upon
to develop or customize applications.
• PaaS makes the development, testing, and deployment of
applications quick, simple, and cost-effective.
• Similar to the way that you might create macros in Excel, PaaS
allows you to create applications using software components
that are controlled by a third-party vendor.
• PaaS is highly scalable , and users don’t have to worry about
platform upgrades or having their site go down during
Infrastructure as a Service•
• Cloud infrastructure services, known as “Infrastructure as a
Service”• (IaaS), deliver computer infrastructure (such as a
platform virtualization environment), storage, and networking.
• Instead of having to purchase software, servers, or network
equipment, users can buy these as a fully outsourced service.
• Compared to SaaS and PaaS, IaaS users are responsible for
managing more: applications, data, runtime.
• What users gain with IaaS is infrastructure on top of which they
can install any required platforms. Users are responsible for
updating these if new versions are released.
Software as a
Platform as a
Infrastructure as a
Examples of Models
• Less Infrastructure
• Data on the platform
• Applications on the cloud
Purpose & Benefits
Cloud computing works using economies of scale:
• It potentially lowers the expense for start up companies
• Cost would be by on-demand pricing
• Dependence on others
• There are also issues relating to policy and access:
› What happens if the remote server goes down?
› How will you then access files?
› What in cases of users being locked out of accounts and
losing access to data?
• Performance and High Bandwidth Cost
• Instant software updates and that too online
• Latest version availability
• No obsolete software and high upgrade costs
• Unlimited storage capacity
• Increased data reliability
• Universal document access
• Requires a constant Internet connection
• Low Speed connections
• Features might be limited
• Sometimes can be slow
• Stored data can be lost
• $180 billion Estimated global cloud services market by the end of 2015
• $131 billion Estimated global cloud services market by the end of 2013
• 50 million Number of physical servers in the world
• 60% Server workloads that will be virtualized in 2013
• 48% Percentage of the cloud market spent on advertising in 2012
• 21% Annual savings of users who move apps to the cloud
• 1/3 IT budgets to be spent on cloud computing in 2013
As on 5th September 2013