Cloud computing is an internet based computing model were
certain service providers provide software, platforms, devices ,infrastructure,
resources and hosting to customers on a pay and use policy. Users can access
the resources available on the cloud from anywhere across the globe without having any
previous knowledge of managing those resources.
Consider the case of a business firm. As the business grows
their computing needs will also increase. So the company should
develop new hardwares, softwares, infrastructure etc. that suits their
changing, Computing demands keep on changing based on world, economy
and several other factors. This is the situation where cloud computing becomes extremely useful. The firm should not worry about security, operating systems, software
platforms, patches etc. They should only configure their service and the
providers will take care of their fluctuating demands.  The users do not own the physical
infrastructure rather they rent the service from a provider. This helps the
user to avoid heavy infrastructures and its complications. They consume the
resources as a service and pay only for their needs.

Cloud architecture
It consist of two components the front end and back end.
Front end of the cloud architecture consist of the user devices and some
applications needed for accessing the cloud. Back end refers to the cloud
itself. The whole system is monitored via a central server which ensures the
smooth functioning of the system. A software called 
Middle-ware acts as an
interface between the cloud and the user. The cloud will store a copy of the
client’s data to restore the service in case of unexpected breakdowns.

Benefits of cloud computing

  • Reduced expenditure in software and hardware development as
    the infrastructure needed for   accessing the cloud is minimal
  • Since the services are on a pay and use policy the user can
    terminate the contract at any time
  • Increased resource sharing
  • Increased data security at less cost
  • Location independence. The user can access the cloud from
    anywhere across the globe.
  • Demand independent computing
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