Summary

Chapter 1: Introduction to the Personal Computer 35Figure 1-20Digital CamerasBiometric identification uses features that are unique to an individual user, such as fingerprints,voice recognition, or a retinal scan. When combined with ordinary usernames, biometricsguarantees that the authorized person is accessing the data. Figure 1-21 shows a laptopthat has a built-in fingerprint scanner.Figure 1-21Fingerprint ScannerA touch screen has a pressure-sensitive transparent panel. The computer receives instructionsspecific to the place on the screen that the user touches.A scanner digitizes an image or document. The digitization of the image is stored as a filethat can be displayed, printed, or altered. A bar code reader is a type of scanner that reads