Host computers all have names. But humans find it easier to remember the latter rather than the former. Clients take information, and servers give information. When you get a great piece of info from the net, you're getting it from a server of some sort. The server is running special computer software to do its serving.
Clients get information.
Servers give it. We'll talk about that later. In fact, we'll spend the rest of the chapters talking about it. Servers and clients are the birds and the bees of the net. A lot like the birds and the bees.