Cloud is not a brand, but a concept. Cloud computing refers to a computing method based on the Internet. Users can remotely use cloud computing resources and services through network connections to achieve data storage, application deployment, software updates and other functions. Cloud computing technology is jointly developed and promoted by many companies and organizations, such as Amazon's AWS, Microsoft's Azure, Google's GCP, etc. They provide various forms of cloud services such as Infrastructure as a Service (IaaS), Platform as a Service (PaaS) and Software as a Service (SaaS), bringing more efficient, flexible and reliable computing resources and services to enterprises and individuals.