Networking allow computers to talk to each other even when at opposite sides of the planet. To the electrical engineer the subject focusses on the hardware. For the computer scientist it is more about the algorithms that allow different computers to talk using that hardware in reliable, secure ways. Let's look at a couple of different aspects to give a flavour. Creating a network that works is much more than getting the wires in the ground, putting the masts up and getting the packets from one place to the other. There are many different and important services a network must provide. Each builds on the lower level services that already exist. One important service is to provide ways to make sure that only the people you want to can read your communications (cryptography). Another is in making sure you don't send more data than you need to (data compression).
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