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Cloud computing is a technology paradigm that involves delivering various computing services, including servers, storage, databases, networking, software, analytics, and more, over the internet (the cloud) to provide faster innovation, flexible resources, and cost savings. Instead of owning and maintaining physical hardware and software, users can access these services on a pay-as-you-go basis from cloud service providers.

Key characteristics of cloud computing include:

1. On-Demand Self-Service: Users can provision and manage resources as needed without requiring human intervention from the service provider.
2. Broad Network Access: Cloud services are accessible over the internet from a wide range of devices.
3. Resource Pooling: Computing resources are pooled to serve multiple customers, allowing for cost efficiency and resource optimization.
4. Rapid Elasticity: Users can scale their resources up or down as needed, often automatically, to handle fluctuating workloads.