Firstly, the main difference of a router and a modem is modem help to connect us to the internet and the router is help distributes internet connection to our devices.

Next, lets get know what the other difference between a modem and router.

Modem

After that, A cable modem is a hardware tool that makes use of a coax cable to ​join your laptop gadgets together along with your Internet carrier provider (ISP). ​A cable modem connects to the Internet.

Router

Not only that, A router now and again referred to as a gateway connects to the Internet ​and distributes the net connection to more than one devices like a router does.

Finally, a modem and router is usually need to use both of it because its then only can be generate a high speed of internet as its own mbps and reach its maximum when it get used