Chapter 4. Installing and Configuring an Operating System

The operating system (also called the OS, pronounced oh-ess) is the most important software on your computer because it represents the interface between you, running software programs, and the machine’s underlying hardware.

To put this discussion in a more meaningful context, let’s say that you want to send an email message from your computer or mobile device. You compose and send your message by using a web browser or a dedicated email application. The computer’s operating system translates your keystrokes and mouse movements into instructions that are understood by your application.

When you click Send, the OS then conducts the message through a number of subsystems, including translating ...

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