2. WHAT IS INTERNET
Internet is a collection of local, regional,
national and international computer networks
that are linked together to exchange data and
distribute processing tasks.
It converts the whole world into a global village
3. TYPES OF COMPUTER IN INTERNET
Servers
Computers which offer information to be read.
Clients
Computer that read the information offered.
4. NETWORK
Network
collection of computers and other hardware components
interconnected by communication channels that allow
sharing of resources and information
Types of network
LAN(Local Area Network)
MAN(Metropolitan Area Network)
WAN(Wide Area Network)
5. ESTABLISHING CONNECTIVITY ON THE INTERNET
TCP/IP protocol is used to set up communication
between a client and a server on the internet
It breaks up data into datagram and guarantees
that the data is correctly received at its destination
6. WORLD WIDE WEB(WWW)
A system of interlinked hypertext documents accessed
via the internet.
Computer scientist Sir Tim Berners Lee wrote a
proposal for world wide web in 1989.
It is a worldwide information service on the internet.
WWW is an organization which provides information
on the internet.
7. Web server: a system on the internet containing one or
more web site
Web site: a collection of one or more web pages
Web pages: single disk file with a single file name
Home pages: first page in website
Terminology
8. URL AND HTTP
URL(UNIFORM RESOURCE LOCATOR)
It is the global address of documents and
other resources on the World Wide Web.
HTTP(HYPERTEXT TRANSFER PROTOCOL)
HTTP defines how messages are formatted and
transmitted, and what actions Web
servers and browsers should take in response to
various commands
9. HTML
HyperText Markup Language
the publishing language of the World Wide Web
the standard used to create web pages
defines the structure of information by using a
variety of tags and attributes.
10. How to Create and View an HTML document?
1.Use an text editor such as Editpad to write the
document.
2.Save the file as filename.html on a PC. This is called
the Document Source.
3.Open Netscape (or any browser) Off-Line
4.Switch to Netscape
5.Click on File, Open File and select the filename.html
document that you just created.
6.Your HTML page should now appear just like any
other Web page in Netscape
11. HTML TAGS
•Tags are the instructions that are embedded
directly into the text of the documents
•All HTML tags begin with an open angle
bracket(<) and end with the close angle
bracket(>).
12. TYPES OF TAGS
Paired Tags
•Has a companion tag with
it.
•Paired tag has to be
closed after its usage is
complete.
•For eg. <B> Hello </B> i.e.
bold tag is a paired tag
Singular Tags
•Does not have a companion
tag.
•No need to close the tag after
its usage is complete.
•For eg. <BR> tag to insert a
line break.
13. STRUCTURE OF HTML PROGRAM
<html>
<head>
<title>title of the document goes here</title>
</head>
<body>
….
visible text goes here
….
</body>
<html>
14. DOCUMENT HEAD
Information placed in this section is essential to
the inner workings of the document
It has nothing to do with the content of the
document.
Information placed within <head></head> is not
displayed in browser
Except the title placed in <title></title> which is
displayed on the title bar of the browser
16. TEXT FORMATTING
Paragraph Breaks <p>:
moves onto a new line, skipping one line
between previous line and the new line.
Line Breaks <br>:
Same as <p> tag but it does not skip a line.
18. OTHER TEXT EFFECTS
Example:
<font face=“arial” color=“red”
Size=7 >hello</font>
Centering( text, images):
<center>text</center>
Controlling Font Size and Color:
<font>text</font>
Attributes:
Face: sets font to the specified name
Size: sets size of text(between 1-7).
Default size =3
Color: sets color of the text.
19. Tag used is <img >
ATTRIBUTES
Align, height, border, width, src, alt
Example:
<img src=“imag_name1.jpg”
align=“center” height= 100 width
=100 alt=“image”>
Images
20. Tag used is <a href >
To change the color of the links we add the following attributes in the
<body>
• link
• Alink
•Vlink
Example:
External document references
<a href=“file.html”></a>
Internal document references
<a name=“ location name”>
<a href=“#location name”></a>
Linking Documents
21. LISTS
• Unordered lists(Bullets)
•Tag used is <ul></ul>
•Attributes:
•Type
Example:
<ul type=“square”>
<li>apple</li>
<li> banana</li>
</ul>
• Ordered lists(Numbering)
•Tag used is <ol></ol>
•Attributes:
Type,start,value
Example:
<ol type=“1” start=“5”>
<li value=“6”>apple</li>
<li> banana</li>
</ol>
