1. Terminal, also known as terminal device, is the peripheral device in the computer network, which is mainly used for the input of user information and the output of processing results.
 2. In the early computer system, because the host computer was expensive, a host computer (IBM mainframe computer) would generally be configured with multiple terminals. These terminals themselves did not have computing power, but only undertook the work of information input and output. The computation and processing were completed by the host computer.
 3. In the era of personal computers, personal computers can run programs called terminal emulators to simulate the work of a terminal.
 4. With the development of mobile network, mobile terminals (such as mobile phones, PAD) have been widely used.
 5. At this time, the terminal can not only undertake the work of input and output, but also carry out certain operations and processing to realize some system functions.