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!
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: [email protected]
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