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Cloud Computing
読み方：Cloud Computing
On-demand delivery of computing resources (servers, storage, databases, networking) over the internet. AWS, Google Cloud, and Azure are the three major providers. Key benefits include reduced upfront capital, elastic scaling, and global reach.
What is Cloud Computing
Cloud computing lets businesses use computing infrastructure—servers, databases, storage—without owning or operating physical hardware. You pay for what you use, scale up or down on demand, and access resources from anywhere.
Service Models
- • IaaS (Infrastructure as a Service): Virtual machines, storage, networking (AWS EC2, Google Compute Engine)
- • PaaS (Platform as a Service): Managed application runtime (AWS Elastic Beanstalk, Google App Engine)
- • SaaS (Software as a Service): Complete software products (Gmail, Slack, Salesforce)
Why Businesses Move to Cloud
- • No upfront hardware investment: Pay-as-you-go instead of capital expenditure
- • Scale with demand: Add capacity in minutes, not months
- • Global deployment: Serve users worldwide from regional data centers
- • Managed reliability: Provider handles hardware maintenance and availability
The Three Major Cloud Providers
| Provider | Market Share | Known For |
|----------|-------------|-----------|
| AWS | ~31% | Broadest service catalog |
| Azure | ~25% | Microsoft ecosystem integration |
| GCP | ~11% | AI/ML capabilities |