Discover the transformative power of cloud computing in reshaping modern E-Business IT infrastructures. This comprehensive overview delves into the core cloud service models: Infrastructure as a Service (IaaS) which offers virtualized computing resources, Platform as a Service (PaaS) which provides environments for efficient application development, and Software as a Service (SaaS), delivering software on a subscription basis. By navigating through the intricate benefits and popular providers in each model, E-Businesses will learn the strategic advantages of adopting these technologies— from cost savings and scalability to improved flexibility and accessibility— positioning themselves at the forefront of the digital age.