In the past, computing is conducted separately, mainly based
on individual devices. However, since 2000, before which the
definition of cloudis vague, cloud computing has
become a touchable concept. As Hassan Qusay (2011) points
out, Cloud computing is Internet-based, providing shared
computer processing resources and data to computers and
other devices on demand, a model for enabling ubiquitous, on-
demand access to a shared pool of configurable computing
resources.With the technology of cloud computing, users
can now process and store their data in a remote server. For
example, an American may watch a comedy online in New
York, but the comedy itself can be stored in India. By relying on
sharing of resources, could computing achieves coherence
and economy of scale.
As a result of the evolution and adoption of existing
technologies and paradigms. Cloud aims to allow users to
benefit from all of these technologies and do not need deep
knowledge about or expertise with each of them. By utilizing the
cloud, people can reduce costs and focus on their core
business instead of being impeded by IT obstacles. The main
enabling technology for cloud computing is virtualization.
Virtualization software sets a physical computing device into
multiple virtualdevices. They can be conveniently used
and managed to perform computing tasks. Cloud computing
also leverages concepts from utility computing to provide
metrics for the services. It shares characteristics with Client,
server computing refers broadly to any distributed application
that distinguishes between service provider(servers) and service
requestors (clients), computer bureau, grid computing and fog
Cloud-computing providers offer their servicesaccording
to different models through service-oriented architecture
advocates everything as a service. These models offer
increasing abstraction, thus often portrayed as a layers in a
stack: infrastructure-, platform- and software-as-a-service. Users
access cloud computing using networked client devices,
including desktop computers, laptops, tablets and smartphones
and any Ethernet enabled device such as Home Automation
Gadgets. Some of these devices rely on cloud computing for all
or a majority of their applications so as to be essentially useless
without it. However, cloud computing poses privacy concerns
because the third-party service provider can access the data
that is in the cloud at any time. Information could be altered or
even deleted accidentally or deliberately. Many cloud
providers can also share information with others because of law
purposes and order even without a warrant, as permitted in
their privacy policies. So the privacy problem would be a big
concern in the widespread use of cloud.
1: How can the privacy of users of cloud products be
2: What is the limitation of publicizing cloud products?
3: What are some technical obstacles of building the cloud?