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THE INTERNET AND WORLD WIDE WEB: Chapter 2 by Silvia Pereira.

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Presentation on theme: "THE INTERNET AND WORLD WIDE WEB: Chapter 2 by Silvia Pereira."— Presentation transcript:

1 THE INTERNET AND WORLD WIDE WEB: Chapter 2 by Silvia Pereira

2 History of the Internet Began as a networking project by the Pentagon – Goal was to build a network that: Allowed scientists from around the world to share information and work together Could work even if part of the network was destroyed by a disaster

3 How the Internet Works Connecting to the Internet – Dial-up access The modem on the computer uses a telephone line to connect (slow speed) – DSL and ISDN A higher speed connection using regular copper telephone wires – Cable Modem Provides high-speed connection through a cable television network

4 Access Providers These are businesses that give people and companies access to the Internet for a fee. – An ISP gives phone numbers which allow access Connects people to an access point (point of presence: POP) – An OSP includes member-only features – A WSP provides wireless access to users with wireless modems or Web-enabled mobile devices

5 How Data Travels the Internet Connected computers work together to transfer data and information around the world – Use servers and clients Carriers of network traffic are known as the Internet backbone Data is transferred from one network to another until it reaches its final destination

6 Internet Addresses An addressing system is needed to send data to a specific destination – An IP address is a number that uniquely identifies each computer to the Internet – A Domain name is the text version of an IP address Every domain name has a top-level domain, identifying the organization associated with the domain

7 The World Wide Web Each document on the Web is called a Web page A Web site is a collection of related pages and items that are stored on a Web server A Web browser allows users to use pages A home page is the first page a Web site shows – Can be changed to whatever the user wants it to be Downloading is how a computer gets information

8 Web Addresses Each Web page has a unique address, known as a URL A URL is typed into the Address text box at the top of the browser window – It consists of a protocol, domain name, and maybe a path to a specific page A Web server is a computer that sends requested pages to computers

9 Navigating Web Pages Links – Connect from a Web page to another related page Nonlinear way to get information – Use of links is referred to as “surfing the Web” – Are usually underlined and in a color different from the other text on that page

10 Searching for Info on the Web A search engine finds Web sites and pages about chosen topics – Keywords are entered in the text box – Hits, or Web page names that contain text with the keywords, are displayed A spider is a program that saves the list of keywords used A subject directory puts pages into a set of categories

11 Types of Web Pages Portal News Informational Business/Marketing Educational Entertainment Advocacy Personal Caution! No one oversees the contents of these pages, so don’t assume they’re accurate.

12 Multimedia on the Web An application that combines text with: – Graphics – Animation – Audio – Video – Virtual reality – Plug-Ins

13 E-Commerce A business transaction occurring over the Web – B2C: sale of goods and services to the public Electronic storefront – C2C: when one consumer sells directly to another Online auction – B2B: when a business offers goods and services to another business Technical support

14 E-Mail It’s the transmission of messages and files via a computer network – E-mail program: used to conduct e-mails – One must address to whom e-mail is being sent to An address has a user name and a domain name A user name is unique to each user in a domain – Address books are useful Contains a list of names and e-mail addresses

15 FTP and Mailing Lists File Transfer Protocol – Permits file uploading and downloading Mailing Lists – Group of e-mail names and addresses under a single name Everyone on that list receives a copy of a message in their mailbox Can subscribe and unsubscribe

16 Newsgroups and Message Boards Newsgroups: – Online area where users have discussions about a particular subject through articles – Members send messages so others can reply Thread: a discussion that’s made up of an original article and all subsequent replies – A news server stores and distributes messages – Message boards are similar to newsgroups, but they don’t need a newsreader to participate in discussion

17 Chat Rooms and Instant Messaging Chat rooms – Place on the server that allows users to chat Chat: a real-time conversation – Real-time: people are conversing online at the same time; no time elapse Instant Messaging – Communication service that allows people to exchange message or files Also in real-time

18 Netiquette Code of acceptable behaviors users should follow on the Internet – Avoid offensive language – Avoid sending spam – Don’t use all capital letters It’s like SHOUTING! – Use emoticons to express emotion : ) – Use abbreviations and acronyms for phrases BRB means Be Right Back

19 Web Publishing It’s the development and maintenance of Web pages Five major steps to Web publishing – Plan a Web site – Analyze and design a Web site – Create a Web site – Deploy a Web site – Maintain a Web site

20 5 Steps of Web Publishing Plan a Web site – Identify the purpose of the site – Determine ways to make the site unique Analyze and design a Web site – Determine how to meet the aforementioned goals – Design the layout Text, graphics, audio, video, and virtual reality – Decide if this is possible, or if it is taking on too much

21 5 Steps of Web Publishing cont’d Create a Web site – Compose the site Deploy a Web site – Store the site on a Web server Registering the site with search engines is a good way to ensure many people see it, for it will appear in the hit list for searches on related keywords Maintain a Web site – Frequently make sure information is updated and links are current

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