I’m confused, I used to think that modem are an old thing now and nobody uses them as modems have a SIM installed in them for internet connection through ISP and it’s like a pen-drive which is insertable to a any PC like normal Pen-drives.
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A modem is a device that converts a signal from your computer into some other kind of signal to talk to other computers. The important part here is ONE computer connects to a modem.
A router is a device that forms a connection between several computers and a network. When it receives a signal from the network, it figures out if any of its connected computers are the recipient and sends the signal there. If any of the computers sends a signal, the router relays that signal over the network.
A router CAN be a modem. That just means the “one computer” connected to the modem is the router itself. So it gets a signal from somewhere like phone lines or cellular signals, coverts those signals to the signal the computers use, and also figures out which computer should receive the signal (if any).
But a modem can’t really be a router: they form one connection.
To make an analogy:
A modem is like a person’s personal secretary. If you call the secretary, they can take a message and send it to their boss. If you ask them to give a message to someone else, that’s kind of not their job and they might not do it.
A router is more like the receptionist in a large office. They don’t work for one specific person, so if you call them and ask for someone in the office the receptionist can forward your call or relay your message for you.
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