Cloud computing has revolutionized how businesses and individuals access and manage data. It involves delivering computing services like storage, servers, databases, networking, and software over the internet (the cloud). The key benefits of cloud computing include scalability, cost-effectiveness, and flexibility. Instead of maintaining physical hardware and infrastructure, users can store and access data online, scaling up or down based on demand. There are several cloud models: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS), each providing varying levels of control over resources. Companies like Amazon Web Services (AWS), Microsoft Azure, and Google Cloud dominate the industry, offering businesses comprehensive cloud solutions.