A computing capability that provides an abstraction between the computing resource and its underlying technical architecture (e.g., servers, storage, networks), enabling convenient, on-demand network access to a shared pool of configurable computing resources that can be rapidly provisioned and released with minimal management effort or service provider interaction.” This definition states that clouds have five essential characteristics: on-demand self-service, broad network access, resource pooling, rapid elasticity, and measured service. Narrowly speaking, cloud computing is client-server computing that abstract the details of the server away;one requests a service (resource), not a specific server (machine). Cloud computing enables Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). Cloud computing means that infrastructure, applications, and business processes can be delivered to you as a service, over the Internet (or your own network).

In its essence, Cloud Computing is a massive distributed computing model consisting of three tiers: infrastructure , platform and services (see below), and is about using swarms of computers to deliver unprecedented computing power to people and organizations across the globe. Cloud computing isn't a new technology nor a new architecture... it's a new delivery model.

Cloud-Computing ist ein Modell, das es erlaubt, bei Bedarf, jederzeit und überall bequem über ein Netz auf einen gemeinsam genutzten Pool von konfigurierbaren Rechnerressourcen (z.B. Netze, Server, Speichersysteme, Anwendungen und Dienste) zuzugreifen, die schnell und mit minimalem Managementaufwand oder geringer Serviceprovider-Interaktion zur Verfügung gestellt werden können.
(NIST, National Institute of Standards and Technology)

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Definition Cloud-Computing

„Cloud-Computing ist ein Modell, das es erlaubt, bei Bedarf, jederzeit und überall bequem über ein Netz auf einen...
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