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Quick Definition
Public cloud is computing infrastructure owned and operated by a third-party provider and shared across many customers over the internet. It offers on-demand scalability and consumption-based pricing, and is the environment most FinOps and cost-optimization work targets.
Public cloud is computing delivered over the internet from a provider's shared infrastructure: you rent capacity from AWS, Azure, Google Cloud, or another hyperscaler, alongside thousands of other tenants, and pay for what you consume.
Its defining strengths are elasticity and pace: capacity in minutes instead of procurement cycles, global reach without building anything, and a catalog of managed services no single company could replicate. Its defining challenge is that the same frictionless consumption that enables speed also enables waste; spending requires no purchase order, which is precisely why FinOps emerged as a discipline.
Example. A three-person startup launches a product used on four continents within a month of writing the first line of code, on infrastructure that costs hundreds per month and scales automatically when launch traffic arrives.
Public cloud now hosts the majority of new workloads, with most enterprises blending it into hybrid and multi-cloud estates. The cloud providers overview maps the market, and the 101 cloud statistics quantifies the shift.
Generally yes; providers invest in security beyond most companies' reach. Responsibility is shared: they secure the platform, you secure your configuration.
Consumption pricing with no friction: anyone can create spend instantly, and costs accumulate per hour across thousands of resources.
Default to public for variability and speed, private where regulation or steady scale demands it, hybrid when both apply.