Cloud computing is a technology that usesthe internet and central remote servers tomaintain data and applications.
Cloud computing allows consumers andbusinesses to use applications withoutinstallation and access their personal files atany computer with internet access.
This technology allows for much moreefficient computing by centralizing storage,memory, processing and bandwidth.
A simple example of cloud computing is Yahooemail, Gmail, or Hotmail etc. You dont need asoftware or a server to use them. All a consumerwould need is just an internet connection and youcan start sending emails. The server and emailmanagement software is all on the cloud (internet) and is totally managed by the cloudservice provider Yahoo , Google etc. Theconsumer gets to use the software alone andenjoy the benefits.
Cost is claimed to be reduced and in apublic cloud delivery model capitalexpenditure is converted to operationalexpenditure, as infrastructure is typicallyprovided by a third-party and does not needto be purchased for one-time or infrequentintensive computing tasks.
Device and location independence enableusers to access systems using a webbrowser regardless of their location or whatdevice they are using (e.g., PC, mobilephone).
Virtualization technology allows serversand storage devices to be shared andutilization be increased. Applications can beeasily migrated from one physical server toanother.
Reliability is improved if multipleredundant sites are used, which makeswell-designed cloud computing suitable forbusiness continuity and disaster recovery.
Maintenance of cloud computingapplications is easier, because they do notneed to be installed on each userscomputer and can be accessed fromdifferent places.
Security could improve due tocentralization of data, increased security-focused resources, etc., but concerns canpersist about loss of control over certainsensitive data, and the lack of security forstored kernels.•KERNEL IS THE CENTRAL PART OF THE SYSTEM
Security is often as good as or better thanother traditional systems, in part becauseproviders are able to devote resources tosolving security issues that many customerscannot afford.
However, the complexity of security isgreatly increased when data is distributedover a wider area or greater number ofdevices and in multi-tenant systems that arebeing shared by unrelated users.
In addition, user access to security auditlogs may be difficult or impossible.
Amazon Web ServicesThe cloud computing industry leader in theopinion of most experts, Amazon has consistentlyoutranked the competition in both innovation andcustomer service over the past two years.Verizon (Terremark)With the acquisition of Terremark, Verizon wasable to expand its cloud services portfolio into theenterprise market and transform itself into,potentially, the biggest provider in the industry.
IBMThanks to a focused commitment to expanding itscloud services menu, long-time IT behemoth IBMhas been busy eating up a massive chunk of theenterprise market this year.Salesforce.comAlready highly successful in the Software as aService market, Salesforce.com guaranteed itselfa continued place at the big boys’ table for theforeseeable future when it acquired Platform as aService giant Heroku.
CSCSpecializing in IT integrations, CSC recentlylaunched BizCloud – a unique private cloudservice that integrates Infrastructure as a Serviceinto your legacy IT system and interlinks it withSoftware as a Service providers.RackspaceRanking second only to the mighty Amazon incloud-based revenue, Rackspace is poised toremain with the pack leaders thanks to its recent
GoogleThe undisputed king of search engines spent thefirst half of 2011 adding attractive features to itsGoogle App Engine service in a bid to win agreater share of the enterprise market.BlueLockWhen it pioneered a breakthrough improvementin vCloud resources for VMware, BlueLockimmediately established itself as one of theleading VCE providers in the world.
MicrosoftEnjoying tremendous success with its Azurecloud service, Microsoft owns a significant shareof the cloud services market among mobilecompanies, web companies and socialnetworking firms.JoyentTeaming up with Dell to create pre-configured,ready-out-of-the-box cloud infrastructurepackages, Joyent has positioned itself as a leader