Internet surfing and security

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. DISADVANTAGESOF 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. egAirtel, 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
•Acomputer virusis a type of malicious code or program written to alter the
way acomputeroperates and is designed to spread from onecomputerto
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, pendriveetc.

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.