Background
A modem, short for "modulator-demodulator", is a device that allows computers and other devices to connect to the internet or other networks by converting digital signals into analog signals that can be transmitted over telephone lines, cable lines, or other types of communication channels.
In other words, a modem is a device that allows devices to communicate with each other over a network, by translating digital signals into signals that can be transmitted over the network and vice versa. Modems are commonly used to connect computers, routers, and other network devices to the internet or other networks, such as local area networks (LANs) or wide area networks (WANs).
Different types of modems exist depending on the communication medium used. For example, a dial-up modem connects to a phone line to transmit data, while a cable modem connects to a coaxial cable for data transmission. With advancements in technology, modern modems can now support various types of communication channels, including fiber-optic cables, satellite links, and wireless connections.