A modem ("modulator-demodulator") is a device that converts digital information to analog signals and vice-versa, for sending data through networks. Different kinds are used for different networks: DSL modems for telephone wires, WiFi modems for short-range wireless radio signals, 3G modems for cellular data towers, and so on.
Modems are different from routers, but many companies sell modems combined with routers.
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