A database is a warehouse that organizes, stores, and manages data based on a computer storage device.

The database formed by the internal mode is called the physical database;

The data formed by the conceptual model is called the conceptual database;

The database composed of frameworks other than the model is called the user database.

Main features：

①Achieve data sharing；

②Reduce redundancy of data；

③Independence of data；

④Data centralized control；

⑤Data consistency and maintainability to ensure data security and reliability；

⑥Fault recovery.