The cloud delivery and consumption patterns have completely changed the entire IT industry over the past decade as evidenced by the dramatic growth of public cloud services. However, the opportunities inherent in cloud computing are far more than just public cloud services - currently, public cloud services are less than half of all cloud-related costs - it also includes private cloud services and hybrid cloud services, as well as hosted cloud Services, cloud-related professional services, and the hardware and software infrastructure to build the cloud. International Data Corporation (IDC) expects global cloud computing revenue to reach 554 billion U.S. dollars by 2021, more than double the 2016 figure. Frank Gens, senior vice president and chief analyst of IDC said: "The clearest conclusion to this prediction is that the shift to cloud consumption patterns - no matter what form of change - will be a large scale one and will be so over the forecast period. "" But just as important, the constant technological innovations of major public cloud service providers make it impossible for businesses and developers to bypass public cloud services if they are to seek advantage. "In the past few years, major public cloud services Operators introduced a series of innovative new services, including block chain services, IoT back-end data services, encryption services, serverless computing services, and even new computing hardware services. IDC expects the pace of innovation in the public cloud to continue going further and is more likely to accelerate. Similarly,IDC expects cloud service providers and their partners to focus on the new deployment scenarios of these workloads, so as to see the steady expansion of cloud computing business workload. Despite concerns about security, supplier and technology locking and interoperability, IDC believes that cloud computing will continue to dominate and change Business Computing in the next few years.