Presentation on theme: "1 Computer and Internet Basics Unit A. 2 Objectives Define Computers Explore Computer Functions Categorize Computers Examine Personal Computer Systems."— Presentation transcript:
10 Computer Functions Words, symbols, numbers, sound, pictures, program instructionsWords, symbols, numbers, sound, pictures, program instructionsInputInput Program calculates, sorts modifies dataProgram calculates, sorts modifies data Uses microprocessor or CPUUses microprocessor or CPUProcessProcess Memory is temporary holding area (RAM)Memory is temporary holding area (RAM) Storage is permanent (disk)Storage is permanent (disk)StoreStore Results of processingResults of processing Reports, graphs, documents, picturesReports, graphs, documents, pictures Printer or monitorPrinter or monitorOutputOutput
15 More Powerful Computers Server –Supplies network computers with data Mainframe –Large, expensive, powerful, many users –Reliability, data security, central control important Supercomputer –Fastest and most powerful
16 Personal Computers, Cont’d. Desktop computers—small enough to fit on or next to a desk. Can use: –Desktop case –Tower case –All-in-one case
17 Personal Computers, Cont’d. Portable PCs—designed to be carried around. –Notebook computers –Tablet PCs (either slate or convertible) –Handheld computers (pocket computers)
19 Personal Computers, Cont’d. PCs designed for just network use are referred to as network computers (NCs) or thin clients. Devices designed just for Internet access are called Internet appliances.
20 Midrange Servers Medium-sized computers, also called minicomputers or midrange computers. Fall between microcomputers and mainframes in processing power.
21 Mainframe Computers Standard choice for most large organizations. Specialize in high-volume processing of business transactions. Also called high-end servers or enterprise- class servers.
22 Supercomputers Used for applications that have extraordinary demands for processing power. Offer very fast speeds and extreme degrees of accuracy. Commonly created today by connecting hundreds of smaller computers to form a supercomputing cluster.
26 Storage Devices Floppy disk drive Hard disk drive CD-ROM drive DVD drive CD writer DVD writer
27 Data vs. Information Data (symbols) used by computers Information (meaningful) used by people
28 Software The programs or instructions used to tell the computer hardware what to do. System software allows a computer to operate and run application software. Application software performs specific tasks or applications.
30 Data and Information Data = raw, unorganized facts. –Can be in the form of text, graphics, audio, or video. Information = data that has been processed into a useful form.
31 Computer Users and Professionals Computer users, or end users, are the people who use a computer to obtain information. Programmers are computer professionals whose job it is to write the programs that computers use.
32 Data Binary number system to define electronic data 0 or 1 Bit Byte (8 bits)
33 Files Collection of data on a storage medium Data file (passive) Executable file (active) Filename and extension Resume.doc Word.exe Image.jpg
34 System Software Helps the computer monitor itself in order to function efficiently Operating system –Master controller of all computer activities Popular operating systems –PCs: Microsoft Windows, Mac OS –Handhelds: Windows CE and Palm OS –Servers: Linus and UNIX
35 Platform Mac and PC compatibility is an issue Apple computer = Mac platform Original IBM computer = Windows or PC platform Microprocessor + Operating system
36 Application Software Designed to carry out a particular task Microsoft Excel Microsoft PowerPoint
37 Internet Basics Internet is a collection of local, regional, national and international computer networks that are linked together to exchange data and distribute processing tasks.
38 Internet Terminology Backbone: defines main Internet routes –Constructed and maintained by major telecommunications companies TCP/IP: –Transmission Control Protocol/ Internet Protocol
39 Internet Terminology Server software IP Address: unique number for each Internet computer Packets: small chunks of data ready to travel the Internet Router: helps send along the packets to correct destination
40 Internet Resources E-commerce E-mail Web Sites Chat Groups Internet Radio Download Or Upload Usenet Internet Telephony Instant Messaging P2P file sharing
41 Modem Internet Connections Dial-up connection via modem (56K) Cable modems –Network card and cable modem required –Always-on and 25 times faster than dial-up
42 Faster Internet Connections ISDN (Integrated Services Digital Network) –64K or 128K –Always-on and expensive DSL (Digital Subscriber Line) –Up to 125 times faster than dialup DSS (Digital Satellite Service) –500K Need proximity to a telephone switching station
43 Internet Service Provider (ISP) Provides internet access to businesses, organizations and individuals Provides telecommunications equipment User ID and password required Connects you to backbone E-mail account monthly fee Should have local access telephone numbers
44 World Wide Web Basics Files interconnected via hypertext Web pages make up a web site Home Page Links or hyperlinks Web servers
45 World Wide Web Basics URL –No spaces and Case sensitive –HTTP (Hypertext Transfer Protocol) HTML (Hypertext Markup Language) –.htm or.html file extension Document name and filename extensionFoldername Webservername Webprotocolstandard http://www.cnn.com/showbiz/movies.htm
47 Using Browsers Can type URLs HTML tags tell browser how to display web page data Back, forward and stop buttons Setting a home page Print and copy options History list Favorites and bookmarks Edit and Find Microsoft Internet Explorer® and Netscape Navigator®
48 E-mail Basics Account = Mailbox MessageAttachment Most use HTML format Netiquette userid@computer
49 E-mail System E-mail servers Store-and-forward technology Types –POP (Post Office Protocol) used via ISP –IMAP (Internet Messaging Access Protocol) –Web-based like Hotmail
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