CGS 1000

Discovering Computers Fundamentals, Third Edition

CGS 1000CGS 1000

Introduction to Computers and Introduction to Computers and TechnologyTechnology

Spring 2007Spring 2007


Chapter 2Chapter 2

The Internet and World Wide The Internet and World Wide WebWeb


Topics CoveredTopics Covered

Definition of Definition of homepage, homepage, downloading, downloading, URL, URL, hyperlink, hyperlink, search engine, search engine, subject directorysubject directory

Types of websitesTypes of websites Guidelines for evaluating the value of a Guidelines for evaluating the value of a

websitewebsite


The World Wide WebThe World Wide Web

Multimedia:Multimedia: Application integrating text with other Application integrating text with other

elements like:elements like: Graphics,Graphics, Animation,Animation, Audio, Audio, Video,Video, Virtual realityVirtual reality Plug-insPlug-ins



Graphic:Graphic: Digital representation of non-text Digital representation of non-text

information such as drawing, chart, information such as drawing, chart, photograph. Different formats:photograph. Different formats:

1.1. JPEG: (Joint Photographic Experts JPEG: (Joint Photographic Experts Group) .jpg, .jpeg, .jpe, .jfifGroup) .jpg, .jpeg, .jpe, .jfif

2.2. GIF: (Graphics Interchange Format) .gif works GIF: (Graphics Interchange Format) .gif works best for images with few distinct colors.best for images with few distinct colors.

Thumbnail: small version of a larger image Thumbnail: small version of a larger image used to improve web page display time.used to improve web page display time.



Animation:Animation: Appearance of motion created by displaying Appearance of motion created by displaying

a series of still images in sequence.a series of still images in sequence. Audio:Audio:

Music, speech, or any other soundMusic, speech, or any other sound Individual compressed sound files that you Individual compressed sound files that you

download from the Web to your computerdownload from the Web to your computer Common Web audio file formats are AA, Common Web audio file formats are AA,

AAC, AIFF, ASF, AAC, AIFF, ASF, MP3MP3, WAV, WMA, RA, and , WAV, WMA, RA, and QTQT



Streaming Audio:Streaming Audio: Transfers data in a continuous and Transfers data in a continuous and

even flow.even flow. Enables you to listen to the sound as it Enables you to listen to the sound as it

downloads to your computerdownloads to your computer Radio stations use streaming audio to Radio stations use streaming audio to

broadcast over the Webbroadcast over the Web



Video:Video: Consists of full-motion images with Consists of full-motion images with

soundsoundplayed back at various speedsplayed back at various speeds

MPEG (Moving Pictures Experts MPEG (Moving Pictures Experts Group) is popular video compression Group) is popular video compression standardstandard



Virtual Reality:Virtual Reality: Use of computers to simulate real or Use of computers to simulate real or

imagined environmentimagined environment Appears as a three dimensional (3-D) Appears as a three dimensional (3-D)

spacespace Used for games and many practical Used for games and many practical

applicationsapplications



Plug-ins:Plug-ins: Programs Programs

that extend that extend the the capability capability of a of a browserbrowser

You can You can download download many plug-many plug-ins at no ins at no cost from cost from various various Web sitesWeb sites


Web PublishingWeb Publishing

Step 4.Deploy the Web site

Step 1.Plan the Web site

Step 3.Create the Web site

Step 2.Analyze and design the Web site

Step 5.Maintain the Web site


E-CommerceE-Commerce

Electronic CommerceElectronic Commerce Business transaction that occurs Business transaction that occurs

over the Internetover the Internet 3 types:3 types:

1.1. B2C (Business-to-consumer)B2C (Business-to-consumer)

2.2. C2C (Consumer-to-consumer)C2C (Consumer-to-consumer)

3.3. B2B (Business-to-business)B2B (Business-to-business)


E-CommerceE-Commerce B2CB2C

Sale of goods & services to general publicSale of goods & services to general public E.g.: DellE.g.: Dell

C2CC2C One consumer sells directly to another.One consumer sells directly to another. Online auctionOnline auction E.g.: eBayE.g.: eBay

B2BB2B Businesses provide goods & services to other Businesses provide goods & services to other

businessesbusinesses Online advertising, recruiting, trainingOnline advertising, recruiting, training


Other internet servicesOther internet services

EmailEmail Electronic mailElectronic mail The transmission of messages and files The transmission of messages and files

via a computer networkvia a computer network Messages can consist of simple text or can Messages can consist of simple text or can

contain attachments, such as documents, contain attachments, such as documents, graphics, or audio/video clipsgraphics, or audio/video clips

Internet access providers usually provide Internet access providers usually provide an e-mail programan e-mail program


How does an e-mail How does an e-mail message travel?message travel?

Step 4.When recipient uses e-mail software to check for e-mail messages, the message transfers from incoming mail server to recipient’s computer

Step 2.Your software contacts software on your ISP’s outgoing mail server

Step 3.Software on outgoing mail server determines best route for data and sends message, which travels along Internet routers to recipient’s incoming mail server

Step 1.Using e-mail

software, you create and send message



FTPFTP File Transfer ProtocolFile Transfer Protocol Internet standard that permits you to Internet standard that permits you to

upload and download files with other upload and download files with other computers on the Internetcomputers on the Internet

Newsgroup Newsgroup Online area where users discuss a Online area where users discuss a

particular subjectparticular subject Message BoardsMessage Boards

Web based discussion groupWeb based discussion group



Mailing ListMailing List Group of e-mail addresses given a single Group of e-mail addresses given a single

namename When a message is sent to the mailing list, When a message is sent to the mailing list,

everyone on the list receives the messageeveryone on the list receives the message ChatChat

Real-time typed conversation that takes Real-time typed conversation that takes place on a computerplace on a computer

Chat room is location on server that Chat room is location on server that permits users to discuss topics of interestpermits users to discuss topics of interest



Instant MessagingInstant Messaging A real-time Internet communications A real-time Internet communications

service that notifies you when one or service that notifies you when one or more people are online and allows you more people are online and allows you to exchange messages or filesto exchange messages or files

Internet TelephonyInternet Telephony Enables users to speak to other users Enables users to speak to other users

over the Internet using their computerover the Internet using their computer


NetiquetteNetiquette

Internet etiquetteInternet etiquette Code of acceptable behaviors users Code of acceptable behaviors users

should follow while on the Internetshould follow while on the Internet Golden Rule: Treat others as you Golden Rule: Treat others as you

would like them to treat you.would like them to treat you.


Chapter SummaryChapter Summary

History and structure of the InternetHistory and structure of the Internet


E-MailE-Mail

FTPFTP

Newsgroups and Message BoardsNewsgroups and Message Boards

Chat Rooms and Instant MessagingChat Rooms and Instant Messaging

Internet TelephonyInternet Telephony

NetiquetteNetiquette


Questions?Questions?

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