Definition
Public cloud refers to computing services offered by third-party providers over the public internet, making them available to anyone who wants to use or purchase them. These resources, such as servers, storage, and applications, are owned and operated by the cloud provider and shared among multiple customers. In practice, users access these services on demand through a web browser or API, paying only for the resources they consume. This model is crucial for businesses seeking scalability, cost efficiency, and rapid deployment of IT infrastructure without the burden of managing physical hardware. For instance, a startup can quickly launch a website using public cloud hosting from providers like Amazon Web Services or Microsoft Azure. Unlike private clouds, which are dedicated to a single organization, public clouds are multi-tenant environments. Understanding public cloud is essential for certifications like AWS Certified Solutions Architect Associate and CompTIA Cloud+.