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wiki/concepts/Cloud-Computing.md

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+---
+title: "Cloud Computing"
+type: concept
+tags: [cloud, infrastructure, iaas, paas, saas]
+sources: [the-myths-and-misconceptions-about-cloud-computing-linkedin, what-i-know-about-cloud-service-delivery-1, cloud-maturity-model-a-detailed-guide-for-cloud-adoption]
+last_updated: 2025-03-02
+---
+
+## Definition
+
+Cloud computing is the delivery of computing services—including servers, storage, databases, networking, software, analytics, and intelligence—over the Internet ("the cloud") to offer faster innovation, flexible resources, and economies of scale.
+
+## Service Models
+
+- **IaaS (Infrastructure as a Service)**: Provides virtualized computing resources over the internet (e.g., AWS EC2, Azure VMs)
+- **PaaS (Platform as a Service)**: Provides a platform for developing, running, and managing applications without dealing with infrastructure (e.g., AWS Elastic Beanstalk, Azure App Service)
+- **SaaS (Software as a Service)**: Provides software applications over the internet on a subscription basis (e.g., Microsoft 365, Salesforce)
+
+## Key Characteristics
+
+- **On-demand self-service**: Provision resources as needed without human intervention
+- **Broad network access**: Access services over the network via standard mechanisms
+- **Resource pooling**: Multiple customers share infrastructure with logical separation
+- **Rapid elasticity**: Scale resources up or down dynamically
+- **Measured service**: Pay-as-you-go pricing model
+
+## Common Misconceptions
+
+According to [[the-myths-and-misconceptions-about-cloud-computing-linkedin]], the following misconceptions are prevalent:
+
+1. **Cloud is not secure** → Reality: Major providers invest heavily in security (encryption, MFA, ISO 27001, HIPAA, GDPR compliance)
+2. **Cloud is just "someone else's computer"** → Reality: Cloud is a sophisticated network of data centers with redundancy and high availability
+3. **Cloud is too expensive** → Reality: Pay-as-you-go model with proper management can be cost-effective
+4. **You lose control of your data** → Reality: Cloud provides robust data governance and control tools
+5. **Cloud is only for large enterprises** → Reality: SMBs can leverage enterprise-grade technology without large upfront investments
+6. **Migration is too complex** → Reality: Phased migration and hybrid cloud solutions mitigate risks
+7. **Cloud performance is unreliable** → Reality: SLAs often guarantee 99.99%+ uptime
+
+## Related Concepts
+
+- [[Hybrid-Cloud]]: Combining on-premises infrastructure with public cloud
+- [[Multi-Cloud]]: Using multiple cloud providers simultaneously
+- [[Cloud-Migration]]: The process of moving workloads to the cloud
+- [[Cloud-Security]]: Security practices in cloud environments
+- [[Pay-as-you-go]]: Cost model based on actual usage
+- [[High-Availability]]: Design principle for minimizing downtime
+- [[Serverless-Computing]]: Event-driven computing without server management
+
+## Aliases
+
+- Cloud
+- 云计算