Cloud computing provides convenient, on-demand access to a shared pool of configurable computing resources over a network that can be rapidly deployed with minimal management effort. It originated from early internet depictions of networks and documents as "clouds" and now abstracts infrastructure, servers, applications, and platforms. Key characteristics include broad network access, self-service capabilities, resource pooling, scalability, and usage-based pricing. It can improve business efficiency by reducing costs and maximizing resources while providing continuity. Small enterprises may rely more on public clouds while large enterprises adopt private and hybrid cloud models.