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What are the 5 essential characteristics of cloud computing (NIST definition)?
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1. **On-Demand Self-Service** — Provision resources without human interaction with the provider 2. **Broad Network Access** — Available over standard networks from various device types 3. **Resource Pooling** — Multi-tenant sharing of physical infrastructure 4. **Rapid Elasticity** — Scale up/down quickly to match demand 5. **Measured Service** — Usage is monitored and billed (utility model) Mnemonic: **O**nly **B**rilliant **R**unners **E**xcel **M**arathons
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