2. Internet data center (IDC) business appears with the development of the Internet. Its function is to provide customers with services such as data storage, data backup and data exchange by virtue of IDC's rich IT basic resources and highly centralized and standardized operation management system. Customers can build their own information systems by renting IDC services.

3. The basic service form of 3.IDC is resource (including space, host and bandwidth) leasing service. With the continuous development of customer demand, new service modes such as application service provider (ASP) have emerged. Enterprises that can provide such services are generally called IDC service providers.