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The term cloud was used to refer to platforms for distributed computing as early as 1993, when Apple spin-off General Magic and AT&T used it in describing their (paired) Telescript and Persona Link technologies. is that now, instead of just having a device to program, we now have the entire Cloud out there, where a single program can go and travel to many different sources of information and create sort of a virtual service. The example Jim White [the designer of Telescript, X.400 and ASN.1] uses now is a date-arranging service where a software agent goes to the flower store and orders flowers and then goes to the ticket shop and gets the tickets for the show, and everything is communicated to both parties." this terminology was mostly associated with large vendors such as IBM and DEC.
Full-time-sharing solutions were available by the early 1970s on such platforms as Multics (on GE hardware), Cambridge CTSS, and the earliest UNIX ports (on DEC hardware).
The main enabling technology for cloud computing is virtualization.
Virtualization software separates a physical computing device into one or more "virtual" devices, each of which can be easily used and managed to perform computing tasks.
Cloud computing is an information technology (IT) paradigm that enables ubiquitous access to shared pools of configurable system resources and higher-level services that can be rapidly provisioned with minimal management effort, often over the Internet.As an open source offering and along with other open-source solutions such as Cloud Stack, Ganeti and Open Nebula, it has attracted attention by several key communities.Several studies aim at comparing these open sources offerings based on a set of criteria.Cloud computing relies on sharing of resources to achieve coherence and economy of scale, similar to a utility.Third-party clouds enable organizations to focus on their core businesses instead of expending resources on computer infrastructure and maintenance.