Chapter 12Chapter 12 Internet ActivitiesInternet Activities

12.1 World Wide Web 21

12.2 Basic Uses of the Internet 22

12.3 e-Commerce 31

12.4 e-Learning 33

12.5 Public Services on the Internet 34

12.2 12.2 Basic Uses of the InternetBasic Uses of the Internet

A. Web Browsing B. Search Engines or Directories C. E-mail

1. Dedicated e-mail software

2. Web-mail D. E-card E. File Transfer F. Videoconferencing

Chapter 12 Internet Activities

12.2.1 12.2.1 Web Browsing (1)Web Browsing (1)

1. Web Browser Client software contacts remote Web server and requests The Web server of our school is:

http://home.skhtst.edu.hk ORhttp://netdrive.skhtst.edu.hk

MS Internet Explorer and Netscape Netvigatorfreeware (see Chapter 17)

12.2 Basic uses of the Internet

12.2.1 12.2.1 Web Browsing (Web Browsing (2)2)

Downloading receiving files from a server on the Internet

Uploading putting files onto a server

2. HTTP HyperText Transfer Protocol Set of rules used in Web browsers Only for downloading files To upload files to a Web server requires an FTP

software

12.2 Basic uses of the Internet

12.2.1 12.2.1 Web Browsing (Web Browsing (3)3)

3. Interactivity Allowing dialogs between the user and the computer React according to the input of users Typical example : Search Engine Applications

e-commercee-learning delivery of public services etc.

12.2 Basic uses of the Internet

12.2.2 12.2.2 Search Engines and Directories Search Engines and Directories (1)(1)

1. Search EnginesAn interactive program Find Web sites using keywordsReturn a list of URL of the Web sites

Refining your searchuse multiple keywords to reduce the size of search results

How search engine worksCrawler: a program automatically locates new sites by following

hyperlinks from server to server. Information stored in a huge database

12.2 Basic uses of the Internet

12.2.2 12.2.2 Search Engines and Directories Search Engines and Directories (2)(2)

2. Directory A structured directory of topics classifying topics into meaningful categories

12.2 Basic uses of the Internet

Yahoo!

Google

12.2.3 12.2.3 E-mail (1)E-mail (1)

E-mail (electronic mail) Exchange of messages with other users via network e-mail accounts of users

Maintained by the mail server of an organisation

• e.g. ISP, school or Web-mail companyRequires a user name and password to log on the mail server

An e-mail message consists of The message (text + photo + animation) and/orAttachment which is one or more files

12.2 Basic uses of the Internet

12.2.3 12.2.3 E-mail (E-mail (2)2)

1. Dedicated e-mail software Independent of the Web browser

e.g. Microsoft Outlook or Eudora Need configuration:

• Save information about e-mail account and mail server in the computer.

Should not be used with a public computer. Allow secure transmission

that involves digital signature (Chapter 20)e.g. e-cert issued by The Hong Kong Post Office

12.2 Basic uses of the Internet

POP (Post Office Protocol) POP is a communications technology for retrieving e-

mail from a mail server. SMTP (Simple Mail Transfer Protocol)

A communication technology for sending e-mail to a mail server.

Mail server Stores e-mails and forwards new messages to user

computer when he/she login the server. Format: userid@domain.com

12.2.3 12.2.3 E-mail (E-mail (3)3)

2. Web-mail using Web browser Handled by a Web browser e.g. Hotmail

the free e-mail service

Can send or receive mail anywhere Should NOT be used to transmit confidential

information, e.g. credit card number, HKID or passwords etc.

12.2 Basic uses of the Internet

Advantages of e-mail same cost for any

distance number of recipients

fast convenient flexible

can attach any sort of digital files

permanent record

12.2.4 12.2.4 E-cardsE-cards

E-cards Services provided by some Web sites Send greetings or invitations An e-card is usually

Web page or an animation, based on the sender’s choice

Recipient is informed through e-mail

12.2 Basic uses of the Internet

12.2.5 12.2.5 File transferFile transfer

HTTP For downloading only Single way transmission

File Transfer Protocol (FTP) two-way file transfer uploading files to the Web server

publish Web pages Compared with HTTP

more simplemore efficient

12.2 Basic uses of the Internet

12.2.6 12.2.6 Videoconferencing Videoconferencing

Videoconferencing meeting of several people at different locations Each participant has

video input device, microphone, and speakers Dedicated software

e.g. Microsoft Messenger Getting more popular in

conducting business meeting, training and distant learning. Instant messaging

a real-time Internet communications service that notifies a user when one or more people are online and then allows the user to exchange messages or files or join a private chat room with them.

e.g. ICQ, msn

12.2 Basic uses of the Internet

12.3 12.3 E-commerce E-commerce (1)(1)

E-commerce doing business on the Internet for purchasing products and services online

Online storefront a Web site including

A. Electronic catalogue information about the products and the prices

B. Virtual shopping cart used by a customer to collect items e.g. http://www.hongkongflowershop.com

C. Secure transmission transmitting personal and financial data securely

Chapter 12 Internet Activities

12.3 12.3 E-commerce E-commerce (2)(2)

The most common payment method Credit card Using encryption for secure transmission of

personal and financial data Products delivered by post or delivery services

Modes of operation B2C: business to consumer

retail online storefront B2B: business to business

purchase orders between companies C2C: consumer to consumer

customers post their products online for others to bid.

Chapter 12 Internet Activities

12.3 12.3 E-commerce E-commerce (3)(3)

Impact of e-commerce Allow shopping without leaving home Security concern:

personal information is stolen during the transmissioncheated by an Internet fraud shop

Many companies are investing on this new platform Will be more popular when

more people understand the secure transmissionfurther improvement in Internet security

Chapter 12 Internet Activities

12.4 12.4 E-learning E-learning

E-learning learn through electronic media, like the Internet Ranging from learning in cyber university to life-long

learning Different from traditional lectures

Learn any time and anywhere -- No need to travelSelf-paced -- No fixed time-table or course duration.

Tools:Text, multimedia learning material, interactive softwareMost Web based courses require:

• Answer certain questions before proceeding to the nextVideoconferencing-- learn with other people

Chapter 12 Internet Activities

http://www.rthk.org.hk/elearning/GoGoJapan/map.htm

12.5 12.5 Public Services Using the InternetPublic Services Using the Internet

Electronic Service Delivery (ESD) Scheme Use of IT to deliver government services More efficient and cost-effective

saving time and money

One-stop-shop and accessible anytime.Accessible on the Internet.

Without leaving home, you can pay Government bills, book a squash court, renew driving

licenses, register as a voter, change your personal particulars etc.

Some services requiredigital certificatee.g. paying Government bills

Chapter 12 Internet Activities