Cloud computing is primarily used for providing scalable resources and services over the internet, eliminating the need for local infrastructure. It allows users to access a range of services, including storage, processing power, and applications, on a pay-as-you-go basis. This flexibility enables organizations to scale operations quickly in response to demand without significant capital expenditure. It fosters collaboration by allowing multiple users to access shared resources seamlessly. Common models include Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS), catering to various business needs and enhancing operational efficiency.