Cloud Computing: Concepts, Models, and Challenges

Cloud Computing Definition and Purpose

Cloud computing is a model for providing network access to a scalable and elastic pool of shared physical or virtual computing resources. These resources, including processing power, storage, networks, platforms, and applications, are managed by a service provider and made available to users on demand through the internet. Users generally interact with the cloud as a unified service rather than managing individual hardware and software components. Its purpose is to deliver computing capabilities quickly, flexibly, and efficiently. Cloud services allow users to provision resources automatically, scale them up or down as demand changes, access them from many types of devices, and pay according to usage. This can reduce the need for major upfront infrastructure investments, support collaboration and remote access, and provide managed services such as storage, analytics, artificial intelligence, and machine learning. However, effective use requires attention to security, privacy, costs, compliance, and shared responsibilities between providers and customers.

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Essential Characteristics of Cloud Systems

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