Lecture 2.pptx

DISCOVERING COMPUTERS 2018
Digital Technology, Data, and Devices
Module 2
Connecting and
Communicating
Online:
The Internet,
Website, and Media
Copyright © 2018 Cengage Learning®. May not be scanned, copied or duplicated, or posted to a publicly
accessible website, in whole or in part.

Copyright © 2018 Cengage Learning®. May not be scanned, copied or duplicated, or posted
to a publicly accessible website, in whole or in part.
2-2
Objectives Overview (1 of 2)
• Discuss the evolution of the Internet
• Briefly describe various broadband Internet
connections
• Describe the purpose of an IP address and its
relationship to a domain name
• Describe features of browsers and identify the
components of a web address
• Describe ways to compose effective search text

2-3
Objectives Overview (2 of 2)
• Explain benefits and risks of using online social
networks
• Describe uses of various types of websites
• Explain how the web uses graphics, animation,
audio, video, and virtual reality
• Explain how email, email lists, Internet messaging,
chat rooms, online discussions, VoIP, and FTP
work
• Identify the rules of netiquette

2-4
The Internet (1 of 3)
• The Internet is a worldwide collection of networks
that connects millions of businesses, government
agencies, educational institutions, and individuals
Figure 2-1 People around the world use the internet in daily activities, such as accessing
information, exchanging messages, and conversing with others from their computers and mobile
devices.

2-5
• The Internet originated as ARPANET in September
1969 and had two main goals:
– Allow scientists at different physical locations to share
information and work together
– Function even if part of the network were disabled or
destroyed by a disaster

2-6

2-7
Connecting to the Internet (1 of 10)
• With wired connections, a computer or device
physically attaches via a cable or wire to a
communications device
• Computers without a communications device can
use a wireless modem or other communications
device that enables wireless connectivity

2-8
Figure 2-2 Using a modem is one way to connect computers and mobile devices to the Internet.

2-9
• Wired
– Cable Internet service
– DSL (digital subscriber line)
– Fiber to the Premises (FTTP)
• Wireless
– Wi-Fi (wireless fidelity)
– Mobile broadband
– Fixed wireless
– Satellite Internet Service

2-10
• A hot spot is a wireless network that provides
Internet connections to mobile computers and
devices
Figure 2-3 You can create a mobile hot spot using a communications device
or by tethering a smartphone.

2-11
• An Internet service provider (ISP) is a business
that provides individuals and organizations access
to the Internet free or for a fee
• Bandwidth is a measure of the capability of a
network to send and receive data
– Megabyte (MB)
– Gigabyte (GB)

2-12
Figure 2-4 This figure shows how a home user’s request for eBay’s webpage
might travel the internet using cable Internet service.

2-13
• An IP address is a sequence of numbers that
uniquely identifies the location of each computer or
device connected to the Internet or any other
network
• A domain name is a text-based name that
corresponds to the IP address of a server
• A DNS server translates the domain name into its
associated IP address

2-14
Figure 2-5 The IPv4 and IPv6 addresses, along with the domain name for
Google's website.

2-15
Table 2-3 Popular TLDs
TLD Intended Purpose
.biz Businesses
.com Commercial organizations, businesses, and companies
.edu Educational institutions
.gov Government agencies
.mil Military organizations
.museum Museums and individual museum professionals
.name Individuals
.net Network providers or commercial companies
.org Nonprofit organizations
.pro Licensed professionals
.technology Technology information
.travel Entities whose primary area of activity is in the travel industry

2-16
Figure 2-6 This figure show how a user’s entered domain name
(google.com) uses a DNS server to display a webpage (Google, in this case).

2-17
The World Wide Web (1 of 5)
• The World Wide Web (WWW), or web, consists of
a worldwide collection of electronic documents
(webpages)
• A website is a collection of related webpages and
associated items
• A web server is a computer that delivers requested
webpages to your computer or mobile device
• HTML (Hypertext Markup Language) is a set of
symbols that developers use to specify the
headings, paragraphs, images, links, and other
content elements that a webpage contains

2-18
• A browser is an application that enables users with
an Internet connection to access and view
webpages on a computer or mobile device
– Internet-capable mobile devices such as smartphones
use a special type of browser, called a mobile browser
• A home page is the first page that a website
displays
• Current browsers typically support tabbed
browsing

2-19
Figure 2-7 Many websites, such as the Centers for Disease Control and
Prevention shown here, provide a mobile version that is designed specifically
for display on a mobile browser.

2-20
• A webpage has a unique address, called a web
address or URL
Figure 2-8 After entering http://www.nps.gov/history/preserve-places.htm
in the address bar and then pressing the ENTER key or clicking the
Search, Go, or similar button in a browser, the U.S. Department of the
Interior National Park Service home page shown here is displayed.

2-21
• A web app is an application stored on a web server that
you access through a browser
– Web apps usually store users’ data and information on their
hosts’ servers
Figure 2-9 Web and mobile apps often work together, enabling you to
access your content from a variety of computers and devices.

2-22
Types of Websites (1 of 8)
• A web search engine is software that finds
websites, webpages, images, videos, news, maps,
and other information related to a specific topic
• A subject directory classifies webpages in an
organized set of categories, such as sports or
shopping, and related subcategories

2-23
Operator Description Examples Explanation
Space or +
Display search results
that include specific
words.
art + music art
music
Results have both words, art
and music, in any order
OR
Display search results
that include only one
word from a list.
dog OR
puppy
dog OR
puppy OR
canine
Results have either the word,
dog, or the word, Puppy.
Results have the word, dog, or
the word, puppy, or the word,
canine.
()
Combine search results
that include specific
words with those that
include only one word
from a list.
Kalamazoo
Michigan
(pizza OR
subs)
Results include both words,
Kalamazoo Michigan, and either
the word, pizza, or the word,
subs.

2-24
Operator Description Examples Explanation
_
Exclude a
word from
search results.
automobile-
convertible
Results include the word,
automobile, but do not include the
word, convertible.
“ ”
Search for an
exact phrase in
a certain order.
"19th century
literature"
Results include the exact phrase,
19th century literature.
*
Substitute
characters in
place of the
asterisk.
writer*
Results include any word that
begins with the text, writer (e.g.,
writer, writers, writer's)

2-25
• There are several types of websites
– Search engine
– Online social network
– Informational and research
– Media sharing
– Bookmarking
– News, weather, sports, and other mass media

2-26
• Educational
• Business, governmental, and organizational
• Blogs
• Wiki and collaboration
• Health and fitness
• Science

2-27
• Entertainment
• Banking and finance
• Travel and tourism
• Mapping
• Retail and auctions

2-28
• Careers and employment
• E-commerce
• Portals
• Content aggregation
• Website creation and management

2-29
• Web publishing is the creation and maintenance
of websites

2-30
Digital Media on the Web (1 of 7)
• Multimedia refers to any application that combines
text with media
– Graphics
– Animation
– Audio
– Video
– Virtual Reality

2-31
• A graphic is a visual representation of nontext
information
• Graphic formats include BMP, GIF, JPEG, PNG,
and TIFF

2-32
Figure 2-22 Many webpages use colorful graphics to convey messages. For
example, the variety of colors, images, shapes, and thumbnails on the San
Diego Zoo webpage visually separate and draw attention to areas of the
webpage, making the webpage more dynamic and enticing.

2-33
• An infographic is a visual representation of data
and information, designed to communicate
quickly, simplify complex concepts, or present
patterns or trends
Figure 2-23 An infographic presents complex concepts at a glance.

2-34
• Animation is the appearance of motion created by
displaying a series of still images in sequence

2-35
• Audio includes music, speech, or any other
sound
– Compressed to reduce file size
• You listen to audio on your computer using a
media player

2-36
Figure 2-24 Windows Media Player is a popular media player, through which
you can listen to music and watch video.

2-37
• Video consists of images displayed in motion
• Virtual reality (VR) is the use of computers to
simulate a real or imagined environment that
appears as a three-dimensional (3-D) space

2-38
Figure 2-25 Users can explore a VR world using a touch screen or their input
device. For example, users can explore the inside of the Gemini 7 space
capsule, located at the Smithsonian Air and Space Museum in Washington,
D.C., from their computer or mobile device.

2-39
• A plug-in, or add-on, is a program that extends the
capability of a browser

2-40
Other Internet Services (1 of 11)
• Email is the transmission of messages and files via
a computer network
• An email program allows you to create, send,
receive, forward, store, print, and delete email
messages

2-41
Figure 2-26 This figure shows how an email message may travel from a
sender to a receiver.

2-42
• An email list is a group of email addresses used
for mass distribution of a message
Figure 2-27 When you subscribe to a mailing list, you and all others in the list
receive messages from the website. Shown here is a user who receives
newsletters and alerts from FoxNews .com.

2-43
• Internet messaging services, which often occur in
real-time, are communications services that notify
you when one or more of your established contacts
are online and then allows you to exchange
messages or files or join a private chat room with
them

2-44
Figure 2-28 With Internet messaging services, you and the person(s) with whom
you are conversing are online at the same time. The conversation appears on all
parties' screens at the same time. Shown here is Facebook messenger.

2-45
• A chat is a real-time typed conversation that takes
place on a computer or mobile device with many
other online users
• A chat room is a website or application that
permits users to chat with others who are online at
the same time

2-46
Figure 2-29 As you type, others in the same chat room see what you have typed.

2-47
• An online discussion is an online area in which
users have written discussions about a particular
subject

2-48
Figure 2-30 Users in an line discussion read and reply to other user’s
messages.

2-49
VoIP (Voice over IP) enables users to speak to other
users via their Internet connection
Source: Microsoft

2-50
• FTP (File Transfer Protocol) is an Internet standard
that permits file uploading and downloading to and
from other computers on the Internet
• Many operating systems include FTP capabilities
• An FTP server is a computer that allows users to
upload and/or download files using FTP

2-51
Netiquette
• Netiquette is the code of acceptable Internet
behavior users should follow while on the
Internet
Figure 2-31 Some of the rules of netiquette, with respect to online communications.
Source: Microsoft

2-52
Summary
• Evolution of the Internet
• The web
• Various types of websites and media
• Other services available on the Internet
• Netiquette

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