1, involving a large amount of data. Generally, data need to be stored in auxiliary memory, and only a small part of the data to be processed is temporarily stored in memory.
2. Most data is persistent, that is, it does not disappear with the end of the program, but needs to be stored in the computer system for a long time.
3. These persistent data are shared by multiple applications, even in a unit or a larger scope.
4. Besides the basic functions of data collection, transmission, storage and management, it can also provide users with information services such as information retrieval, statistical reports, transaction processing, planning, design, command, control, decision-making, alarm, prompt and consultation.
The role of information:
1. Information is the basis of human understanding of the objective world and its development law.
2. Information is an indispensable resource element for the objective world and the development of human society.
3. Information is a bridge and tool for transforming science and technology into productive forces.
4. Information is the main reference for management and decision-making.
5. Information is the guarantee of national economic construction and development.
Information refers to the objects transmitted and processed through audio, news and communication systems, and generally refers to all the contents spread by human society. People can distinguish different things by obtaining and identifying different information from nature and society, so as to understand and transform the world. In all communication and control systems, information is a common form of communication.