CHAPTER 2 SUMMARY

CHAPTER 2 SUMMARY - CHAPTER 2 SUMMARY 1. What exactly is a...

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CHAPTER 2 SUMMARY 1. What exactly is a computer, and what are its four main functions? Computers are devices that process data. They help organize, sort, and categorize data to turn it into information. The computer’s four major functions are: (1) to gather data (or allow users to input data), (2) to process that data (perform calculations or some other manipulation of the data), (3) to output data or information (display information in a form suitable for the user), and (4) to store data and information for later use. 2. What is the difference between data and information? Data is a representation of a fact or idea. The number 3 and the words televisions and Sony are pieces of data. Information is data that has been organized or presented in a meaningful fashion. An inventory list that indicates that “3 Sony televisions” are in stock is processed information. It allows a retail clerk to answer a customer query about the availability of merchandise. Information is more powerful than raw data. 3. What are bits and bytes, and how are they measured? To process data into information, computers need to work in a language they understand. This language, called binary language, consists of two numbers: 0 and 1. Each 0 and 1 is a binary digit, or bit. Eight bits create one byte. In computers, each letter of the alphabet, each number, and each special character consists of a unique combination of eight bits (one byte), or a string of eight 0s and 1s. For describing large amounts of storage capacity, the terms megabyte (approximately 1 million bytes), gigabyte (approximately 1 billion bytes), and terabyte (approximately 1 trillion bytes) are used. 4. What devices do you use to get data into the computer? An input device enables you to enter data (text, images, and sounds) and instructions (user responses and commands) into a computer. You use keyboards to enter typed data and commands, whereas you use the mouse to enter user responses and commands. Keyboards are distinguished by the layout of the keys as well as the special keys found on
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CHAPTER 2 SUMMARY - CHAPTER 2 SUMMARY 1. What exactly is a...

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