Why is it that a modem is needed to communicate with the ISP?

Answer 1

All PC modems have a unique identity code ISP - internet SERVICE PROVIDER for the purpose of tracking your identity and location through your modem's signal. Mobile modems (dongles) have several ISP'S and they change each time as you move location and log in.

Answer 2

The reason why you need an ISP ( Internet Service Provider ) is because the computer, needs to know where to get its First Permission Access. This is important, so it can inform the ISP whether this is an proper format!

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Computer_Wizz101

Answer 3

The signals received from, and sent to, the ISP can use different technologies. This includes different voltages (if voltages are used at all - not all technologies use conducting wires), different ways to encode the parts of a message ("frames" in this case), etc. Computers are not normally equipped to handle scores of different networking technologies by themselves; rather, it makes more sense to connect them to a device that handles the specific technology involved.