Cloud computing is a technology that provides computing resources and services over the internet instead of requiring users or businesses to maintain all hardware and software on their own premises. These resources may include servers, storage, databases, networking, software, processing power, and applications. In business, cloud computing enables organizations to access information and applications from anywhere using an internet-connected device. It has become an important part of modern Computer Applications in Business because it reduces infrastructure costs and improves flexibility, collaboration, and efficiency. Cloud computing works through a network of remote servers hosted in data centres. When a business stores files or uses an online application through the cloud, the data and processing may take place on these remote servers rather than on the user's local computer. Cloud service providers manage the physical infrastructure, security systems, software platforms, and maintenance. Users generally pay according to the resources or services they use, making cloud computing suitable for both small and large organizations. There are three major service models of cloud computing. Infrastructure as a Service (IaaS) provides basic computing infrastructure such as virtual machines, storage, and networking. Businesses can use these resources without purchasing physical servers. Platform as a Service (PaaS)