Is used for connecting to other network hardware or computers
Almost all dial up Internet connections use a modem not a network adaptor
Some modems are controlled over a network
A network can be 2 or more computers
The Internet is a very large network with links that use network adaptors
Networks do not always use network adaptors
Computers can be connected to a network by their modems, com ports, USB ports LPT ports etc
They do not have to use network adaptors
The 10/10 is speed of the network adaptor
Modems can be connected by COM ports, USB ports, LPT or Printer ports
They can be internal or external
There is a lot more info on networks all over the internet
It is a very big subject
But can be a lot of fun to learn about