What exactly is cloud service? General definitions include Infrastructure as a Service (IaaS), Platform as a Service (PaaS) and Software as a Service (SaaS). The network services we come into contact with in our daily life include Google, Youtube, Fackbook and so on. In a broad sense, it can be called a cloud service, and the technology to realize cloud service is usually called cloud computing. Major companies have different cloud computing technologies, such as Google's Map-Reduce, IBM's Yun Lan Project, and Microsoft's Azure. The cloud service itself usually contains 1. Distributed computing, 2. Dependence on the Internet, 3. All-weather uninterrupted service and other common features.

Cloud computing is called the next generation Internet, and its foundation comes from today's network services. There are already many network services in the field of education, such as various learning networks and learning platforms. With these existing services, we can think about the prototype and appearance of the next generation of cloud learning services.

Similar to the collaborative platform of Google site, traditional website production needs to consider network bandwidth and other issues besides setting up servers and installing web editing software. Later, hosting service appeared, which solved some hardware environment problems, but for non-technical personnel, install a set of professional web page editing software, edit their own web pages and design the database, and then put it on the virtual host. These processes are still quite complicated and difficult, so finally, network services such as Youxue.com and Zhuo Ya appeared. Users (teachers or students) can apply for an account by connecting to the network, have a certain scale of network space, and use the tools provided by this service to edit their own school and class web pages. In the whole process, users don't need to consider the hardware and network bandwidth, and they don't need to install any software on the local side. They just need to use the browser to complete the webpage production. On the other hand, such services usually provide more resources for paying users, such as determining the size of cyberspace according to the amount of payment, which is in line with the concept of on-demand service in cloud services.