Chapter 1: Introduction to the World of Computers
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1 Chapter 1: Introduction to the World of Computers
2 What Is a Computer and What Does It Do? Computer A programmable, electronic device that accepts data, performs operations on that data, and stores the data or results as needed Computers follow instructions, called programs, which determine the tasks the computer will perform Basic operations Input: Entering data into the computer Processing: Performing operations on the data Output: Presenting the results Storage: Saving data, programs, or output for future use Communications: Sending or receiving data Understanding Computers: Today and Tomorrow, 14th Edition 2
3 Data vs. Information Data Raw, unorganized facts Can be in the form of text, graphics, audio, or video Information Data that has been processed into a meaningful form Information processing Converting data into information Understanding Computers: Today and Tomorrow, 14th Edition 3
4 Information Hierarchy Understanding Computers: Today and Tomorrow, 14th Edition 4
5 Data Does this mean anything to anyone? Understanding Computers: Today and Tomorrow, 14th Edition 5
6 Information SSN Now did this add context? Now what is a SSN? SSN - Unique text corresponds 1 to 1 with an individual => This corresponds to Knowledge Understanding Computers: Today and Tomorrow, 14th Edition 6
7 Computers Then and Now The computer as we know it is a fairly recent invention The history of computers is often referred to in terms of generations Each new generation is characterized by a major technological development Pre-computers and early computers (before 1946) Abacus, slide rule, mechanical calculator Punch Card Tabulating Machine and Sorter Understanding Computers: Today and Tomorrow, 14th Edition 7
8 Computers Then and Now First-generation computers ( ) Enormous and powered by vacuum tubes Used a great deal of electricity and generated a lot of heat ENIAC and UNIVAC Second-generation computers ( ) Used transistors Computers were smaller, more powerful, cheaper, more energy-efficient, and more reliable Punch cards and magnetic tape were used to input and store data Understanding Computers: Today and Tomorrow, 14th Edition 8
9 Computers Then and Now Third-generation computers ( ) Used integrated circuits (ICs) Keyboards and monitors introduced Fourth-generation computers (1971-present) Use microprocessors IBM PC, Apple Macintosh Use keyboards, mice, monitors, and printers Use magnetic disks, flash memory, and optical disks for storage Computer networks, wireless technologies, Internet introduced Understanding Computers: Today and Tomorrow, 14th Edition 9
10 Computers Then and Now Fifth-generation (now and the future) Infancy stage No precise classification May be based on artificial intelligence (AI) Will likely use voice and touch input May be based on optical computers and utilize nanotechnology Understanding Computers: Today and Tomorrow, 14th Edition 10
11 Hardware Hardware: The physical parts of a computer Internal hardware Located inside the main box (system unit) of the computer External hardware Located outside the system unit Connect to the computer via a wired or wireless connection Hardware devices are associated with all five computer operations Understanding Computers: Today and Tomorrow, 14th Edition 11
12 Hardware Input devices Used to input data into the computer Keyboards, mice, scanners, cameras, microphones, joysticks, touch pads, touch screens, fingerprint readers, sensors, etc. Processing devices Perform calculations and control computer s operation Central processing unit (CPU) and memory Output devices Present results to the user Monitors, printers, speakers, projectors, sensors, haptics, etc. Understanding Computers: Today and Tomorrow, 14th Edition 12
13 Hardware Storage devices Used to store data on or access data from storage media Hard drives, CD/DVD discs and drives, USB flash drives, etc. Communications devices Allow users to communicate with others and to electronically access remote information Modems, network adapters, etc. Understanding Computers: Today and Tomorrow, 14th Edition 13
14 Software Software The programs or instructions used to tell the computer hardware what to do System software Operating system starts up the computer and controls its operation Without OS, computer cannot function Boots the computer and launches programs at the user s direction - please research the Boot Process located here: Most use a GUI to interact with the user via windows, icons, menus, buttons, etc. Windows, Mac OS, Linux, etc. Understanding Computers: Today and Tomorrow, 14th Edition 14
15 Application Software Application software Performs specific tasks or applications Creating letters, budgets, etc. Managing inventory and customer databases Editing photographs Scheduling appointments Viewing Web pages Sending and receiving Recording/playing CDs and DVDs Designing homes Playing games Understanding Computers: Today and Tomorrow, 14th Edition 15
16 Computer Users and Professionals Computer users (end users) People who use a computer to obtain information Computer professionals include: Programmers Write programs computers use Systems analysts Design computer systems Computer operations personnel Manage day-to-day computer operations Security specialists Secure computers and networks against hackers Understanding Computers: Today and Tomorrow, 14th Edition 16
17 Computers To Fit Every Need Six basic categories of computers: Embedded computers Mobile devices Personal computers Midrange servers Mainframe computers Supercomputers Understanding Computers: Today and Tomorrow, 14th Edition 17
18 Thin Client and Internet Appliances Thin client or network computer (NC) Device designed to access a network for processing and data storage Lower cost, increased security and easier maintenance Limited or no local storage Not able to function as a computer if network is down Internet appliance Specialized network computer designed for Internet access and/or exchange Some designed to be used in the home Understanding Computers: Today and Tomorrow, 14th Edition 18
19 Computer Networks and the Internet Computer network A collection of hardware and other devices that are connected together Users can share hardware, software, and data Users can communicate with each other Network servers Manage resources on a network Understanding Computers: Today and Tomorrow, 14th Edition 19
20 What are the Internet and the World Wide Web? Internet The largest and most well-known computer network in the world Individuals connect to the Internet using an Internet service provider (ISP) World Wide Web One resource (a vast collection of Web pages) available through the Internet Web sites contain Web pages stored on Web servers Web pages viewed using a Web browser (Internet Explorer, Chrome, Safari, Firefox, Opera, etc.) A wide variety of information is available through the Web Understanding Computers: Today and Tomorrow, 14th Edition 20
21 Accessing a Network or the Internet Need a modem or network adapter to connect Some networks require a username and password Internet connections can be: Direct (always-on) connections Dial-up connections Internet addresses are used to access resources on the Internet IP (Internet Protocol) address Numeric address that identifies computers ( ) Understanding Computers: Today and Tomorrow, 14th Edition 21
22 Accessing a Network or the Internet IP addresses and domain names Text-based address that identifies computers (microsoft.com) Uniform resource locators (URLs) Identify Web pages ( addresses Identifies people for exchange (jsmith@cengage.com) Understanding Computers: Today and Tomorrow, 14th Edition 22
23 IP Addresses and Domain Names IP addresses are numeric and unique Domain names Correspond to IP addresses Top-level domains (TLDs) identifies type of organization or its location Custom TLDs may soon be allowed Understanding Computers: Today and Tomorrow, 14th Edition 23
24 Uniform Resource Locators (URLs) Uniform Resource Locators (URLs) Uniquely identifies a Web page Protocol or standard being used Identification of the Web server Names of folders in which the Web page file is stored Web page s filename Understanding Computers: Today and Tomorrow, 14th Edition 24
25 Addresses addresses consist of: Username A person s identifying name for a particular domain symbol Domain name for the computer that will be handling the person s (mail server) Pronouncing Internet addresses Understanding Computers: Today and Tomorrow, 14th Edition 25
26 Searching the Web Search site: Web page that helps you find Web pages containing the information you are seeking Typically search using keywords Reference Sites Look up addresses, telephone numbers, ZIP codes, maps, etc. Understanding Computers: Today and Tomorrow, 14th Edition 26
27 Can contain photos, attached files, etc. Mobile may require a fee Other types of mobile communications Short Message Service (SMS) Multimedia Message Service (MMS) Understanding Computers: Today and Tomorrow, 14th Edition 27
28 Computers and Society The vast improvements in technology over the past decade have had a distinct impact on daily life, both at home and at work Many benefits of a computer-oriented society Ability to design products before construction leads to safer products Earlier medical diagnoses and more effective treatment Devices that allow physically and/or visually challenged individuals to perform job tasks Documents ed or faxed in moments Download information, music, programs, movies, and more on demand Understanding Computers: Today and Tomorrow, 14th Edition 28
29 Computers and Society Computer-oriented society also has risks Stress and health concerns Spam Computer viruses and malware Identity theft and phishing Privacy issues How data is collected How secure is the collected data Understanding Computers: Today and Tomorrow, 14th Edition 29
30 Computers and Society Differences in online communications Less formal than traditional Netiquette Be polite and considerate of others Refrain from offensive remarks Abbreviations (acronyms) and emoticons Acronyms such as BTW (by the way) Illustrations of faces-- Understanding Computers: Today and Tomorrow, 14th Edition 30
31 Computers and Society Understanding Computers: Today and Tomorrow, 14th Edition 31
32 Computers and Society The Anonymity Factor Gives many individuals a sense of freedom Can also be abused Information Integrity Use common sense when evaluating online content Check your source--not all information on the Internet is accurate Understanding Computers: Today and Tomorrow, 14th Edition 32
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