Cloud computing is the delivery of computing services such as storage, processing power, and software over the internet, rather than using local servers or personal devices. It allows users and businesses to access resources on-demand, scaling up or down as needed, and only paying for what they use. Cloud services are typically offered in three main models: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). This model increases efficiency, reduces costs, and provides greater flexibility for users.