computer and tecnology Internet surfing and security

1. INTERNET – SURFING & SECURITY

2. INTERNET
• Internet is the largest network that links millions of computers with
each other to share information across the world.
• The biggest advantage of the internet is that you can access it
from a computer or mobile device anywhere: at home, at office, at
school or at the restaurant.

3. HISTORY OF INTERNET
• ARPANET (Advanced Research Project Agency Network) was the
first form of network.
• It was set up by the US Department of Defense.
• It was developed for sharing information in research and
development in science and technology.
• Used by government and scientists.
• Was later used to spread education.
• Eventually, grew bigger and led to present form of Internet.

4. ADVANTAGES OF THE INTERNET
• Can get information on any topic.
• Can send and receive e-mail messages
very quickly.
• Can play online games.
• Can listen to music and watch movies

5. DISADVANTAGES OF THE INTERNET
• All information you get on the internet may not
be 100% accurate.
• People spend more time on the internet surfing
irrelevant websites which may affect their work
or study.
• Personal information can be misused on the
internet.

6. REQUIREMENTS FOR THE INTERNET
To use Internet, you need :
 A Computer or a Mobile
 Modem
 Internet connection
 ISP

7. MODEM
• Is a short form for Modulator / Demodulator.
• Is a device that receives data from the internet and sends data
from your computer to the internet.

8. INTERNET CONNECTION
• BROADBAND is a high speed internet connection.
• With broadband access we use a computer, a digital modem and
a broadband line.

9. INTERNET SERVICE PROVIDER
• The internet connection is provided by different companies called
ISP.
• ISP allow you to use Internet on monthly charge. eg Airtel, tatasky,
BSNL (Bharat Sanchar Nigam Limited)

10. SEARCH ENGINE
• Search engine is a program that searches through the collection of
Web pages for a particular information.
• Popular search engines are Google, Bing & Yahoo.

11. WEB BROWSER
• A Web browser or browser, is a software used to access the Internet
• Examples:
• Microsoft Internet Explorer
• Mozilla Firefox
• Google Chrome
• Microsoft Edge

12.  WWW – (World Wide Web): it contains millions of websites that provide
information in the form of text, animation, pictures and videos.
 Webpage – it is an information displayed in the form of a page on the
internet.
 Website – It is a collection of related web pages that provide information.
 Homepage – It is the first page that appears when we open a website.
 E-mail – Email stands for electronic mail. An email address
defines the location of an individual’s mailbox on the internet.

13. COMPUTER VIRUS
• A computer virus is a type of malicious code or program written to alter the
way a computer operates and is designed to spread from one computer to
another.
• It is a program that secretly enters into the computer system in order to
corrupt and destroy the data.
• There are several ways by which a computer is infected with a virus. Some of
these are: Internet, Junk mail, pendrive etc.

14. SYMPTOMS OF A COMPUTER VIRUS
• Unusually slow performance.
• Frequent crashes.
• Unknown or unfamiliar programs that start up when you turn on your
computer.
• Mass emails being sent from your email account.
• Changes to your homepage or passwords.

15. PROTECTING COMPUTER FROM VIRUSES:
• Install an anti-virus software on your computer and update it from time to
time. eg – Norton, Quickheal, Avira etc.
• Never open an email from an unknown person. It may harm your system.