That is, the modem is responsible for translating the signal and the router is responsible for broadcasting and arriving. Therefore, the router is necessary for everyone to reach. The modem is only able to translate the signal and send it to a device. Without a modem, your smartphone or your computer cannot receive the data to connect to the Internet and there are different types of modem depending on the type of Internet connection but they all fulfill the same function of translating the signals and sending them. They are those classic devices that you had in your home years ago and you may remember that you could not talk on the phone while you were using the Internet because they were connected to the telephone line and used the same frequency as the telephone. Through an RJ11 cable, interpret the signal that reaches it and send it via the telephone line to the computer or to the peripheral where you need the connection. What it does is connect to your Internet company and convert the analog signal into a digital signal to take to the different devices to which it is connected. It is a kind of “translator” of signals: the ISP sends signals of all kinds and computers or devices use exclusively digital signals so the modem is responsible for translating or converting those signals to arrive correctly.

A modem, as its name indicates, modulates and demodulates the Internet signal.

Difference modem vs router