Chapter Summary

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The following points summarize the key concepts in this chapter:

The Three Stages of Computing

• Computing occurs in three stages: input, processing, and output.
• All computer hardware can be classified in one or more of these stages.

Components of a Computer

• An input device retrieves data from an outside source and brings it into the computer for processing.
• A processing device takes information and alters it in some useful manner.
• An output device takes the altered information and stores or displays it.

Support Hardware

• Computers require additional components to protect operations and ensure optimal performance.
• Use of surge suppressors and uninterruptible power supplies can protect computers from damage caused by power spikes and surges.