Cloud services available over the internet to anyone who wants to use them, shared among multiple organizations. Like renting an apartment in a building where multiple tenants share infrastructure.
AWS, Microsoft Azure, and Google Cloud are public clouds where thousands of companies rent computing resources on the same infrastructure.
Public cloud services are offered by major providers like AWS, Azure, GCP, and OCI. Each offers a variety of services that are accessible over the internet and are shared among multiple users, but there is no single service that defines 'public cloud' as it is a deployment model.