调制解调器，是调制器和解调器的缩写 ,一种计算机硬件 ,它能把计算机的数字信号翻译成可沿普通电话线传送的模拟信号，而这些模拟信号又可被线路另一端的另一个调制解调器接收，并译成计算机可懂的语言—这一简单过程完成了两台计算机间的通信。

A modem, short for modulator and demodulator, is a piece of computer hardware  that can translate a computer's digital signals into analog signals that can betransmitted along ordinary telephone lines. These analog signals can then be received by another modem at the other end of the line and translated into a language that the computer can understand— This simple process completes the communication between the two computers.