What are the three main types of cloud computing models?

IaaS (Infrastructure as a Service) — you manage servers, storage, networking (e.g., EC2). PaaS (Platform as a Service) — provider manages infrastructure, you focus on deployment and code (e.g., Elastic Beanstalk). SaaS (Software as a Service) — provider manages everything, you use the application (e.g., Gmail, Salesforce). Each model trades control for convenience.