The document outlines computer viruses, describing their nature as self-replicating programs that can corrupt and damage systems. It explains types of viruses such as trojans and worms, their transmission methods, and the common ways they infect PCs, emphasizing the importance of antivirus software for deletion. Additionally, it provides statistics on virus prevalence and offers precautions to prevent attacks.

2. • A program designed to corrupt other
programs.
•Self- replicating programs
• Install themselves without the users
consent.
• Spreads from one computer to another.

3. • Crashes the computer during certain
operations.
• Can delete important files
• Will make your PC inoperable
•Can send wrong messages

6. •Reading an email does not let a virus
get into your PC.
• Clicking on a link or opening an
infected email attachment does.

7. Types of virus?
1) Trojan
 It is a hacking program, which is self replicating.
 It can control all functions of the computer.
 They infect computers without creating any problems.
2) Worms
 It replicates itself to infect other computers.
 They don’t corrupt files, but can delete or modify its
content.
 Standalone software, does not require a host program

8. Who was the first person to create
a virus?
 The first PC virus was a boot sector virus named
Brain, created in 1986 by the Farooq Alvi
Brothers, operating out of Lahore, Pakistan.
 Initially it was not meant to be a destructive virus.

10. How does a virus get on my PC?
 Email attachment is the most common way that
lets a virus enter your PC.
 Downloading documents from the internet.
 Accepting advertisements without reading them
fully.

11. How to delete a Virus?
 The most common method to delete a virus is
using an Antivirus software.

12. Interesting facts about computer
viruses
 40% of US households are affected by computer
viruses followed by Russia.
 90% of emails contain malware (a malicious
software)
 Amazon, Ebay and Apple were some of the
greatest victims of phishing attacks.

13. Precautions to be taken to avoid
virus attack
 Scan removable devices such as CDs, floppy,
USB drive, etc before inserting.
 Avoid installing pirated software's.
 Perform daily scan.
 Don’t click on email links and attachments
 Use strong passwords and change them
regularly
 Install a good Antivirus software.

14. Thank You