Public Cloud
In plain terms
Cloud services shared across many customers over the internet.
Going deeper
A public cloud delivers computing resources from a provider's shared infrastructure on a pay-as-you-go basis. It's the standard cloud model.
Under the hood
Elastic and cost-efficient via multi-tenancy; you trade some control for scale and convenience.
Examples
AWS, Azure, GCP, scalable apps, pay-per-use computing.
Think of it like...
Like using a public utility, paying only for the electricity you consume.