Introduction to the InternetFOLASADE ADEDEJI

Internet Basics

What exactly is the internet, and how does it work?

In this lesson, we will discuss a brief overview of the internet and some fundamental concepts

Content

Definition And History Basic services of INTERNET The World Wide Web (W.W.W.) WWW browsers INTERNET search engines Uses of INTERNET

Before

The internet was used to search for information

Today

The Internet provides new ways of Accessing, Interacting and Connecting with people and content.

As a result, new terms are constantly appearing as new technologies are introduced.

What is the Internet ?

The internet is the largest computer network in the world, connecting millions of computers.

A network is a group of two or more computer systems linked together.

Types of computer network There are two main types of computer

network1. Local Area Network (LAN): A LAN is two or more

connected computers sharing certain resources in a relatively small geographic location, often in the same building

A Local Area Network (LAN)

Types of computer network2. Wide Area Network (WAN): • A WAN typically consists of two or more LANs.

•The computers are farther apart and are linked by telephone lines, dedicated telephone lines, or radio waves.

•The internet is the largest Wide Area Network (WAN) in existence.

Servers and Clients

A server is a computer that "serves" many different computers in a network by running specialized software and storing information.

For example, web pages are stored on web servers.

Server-Client A client runs familiar software such

as web browsers or email software.

It communicates with the server to get the information it requires.

When you access a web page, your computer is acting as a client

A server with multiple clients

WWW

The World Wide Web (WWW) The World Wide Web is a virtual

network of web sites connected by hyperlinks (or "links").

Web sites are stored on servers on the internet,

The World Wide Web is a part of the internet.

Difference between the Internet and WWW

The Internet is the physical network of computers all over the world.

The World Wide Web is a virtual network of web sites connected by hyperlinks (or "links"). Web sites are stored on servers on the internet, so the World Wide Web is a part of the internet.

HTML

HTML stands for Hyper Text Markup Language. A "markup language" is a computer language that describes how a page should be formatted

Web Browser

A Web browser is a computer program (also known as a software application, or simply an application) that does two things:

1. A Web browser knows how to go to a Web server on the Internet and request a page, so that the browser can pull the page through the network and into your machine.

2. A Web browser knows how to interpret the set of HTML tags within the page in order to display the page on your screen as the page's creator intended it to be viewed.

URL (UNIFORM RESOURCE LOCATOR)

The URL, also known as the web address, tells the browser exactly where to find the page.

However, most of the time, people get to a web page by following a link from a different page or by searching for the page with a search engine.

Additional Info

The foundation of the internet began in 1969, when the US Department of Defense created ARPAnet, a project to allow military personnel to communicate with each other in an emergency.

By 2012, the number of internet users worldwide reached 2.4 billion—about one third of the world's population.

To store all of the information on the internet, you would need over 1 billion DVDs or 200 million Blu-ray discs.

Simple test

A home network is an example of ______ Web pages are stored on a _________ A URL is usually typed in a browser's ___ What is tabbed browsing used for?

Basic Service of the Internet

Electronic Mail (E-Mail) – Allow user to send a mail (message ) to another internet user in

any part of the world in a near-real-time manner .

File Transfer Protocol (FTP) – Allow user to move a file from one computer to another on the

internet. (Downloading, uploading)

Telnet – Allow a user to log into another computer somewhere on the

internet .

Common uses of telnet are: - Using a software on the remote computer. - Accessing remote computers data base or achieve. - Logging into ones own computer from another computer. WWW

Additional Info

Some uses of the Internet

On-line communication Software sharing Exchange of views on topics of common interest Posting of information of general interest Organization promotion Product promotion and feedback about products Customer support service On-line journals, magazines, Encyclopedia, and dictionary On-line shopping World-wide conferencing