A virus is a computer program that can copy itself and infect a computer without the user's permission or knowledge. There are 5 main types of viruses: macro, boot sector, network, logic bomb, and worm. An antivirus is a security program installed on a computer to protect it from viruses. Popular antivirus software includes K7, Kaspersky, Quickheal, and Avast Norton. A firewall protects a computer when connected to a network. Hackers break into computers to change data without permission, while crackers break in but do not change data. Freeware is free programming offered for download and use. An operating system acts as an interface between the user and computer, with examples including Windows XP, 7, 8,

1. Computer Security
1. What is a Virus?
Ans:Virus is a computer program that can
copy itself and infect a computer without
permission or knowledge of the user.
2. What are the different types of Virus?
Ans: There are 5 types of Virus
1.Macro Virus
2.Boot sector Virus
3.Network virus
4.Logic Bomb virus
5.Worm virus
3. What is an antivirus ?
Ans: Antivirus is a security program , that
is installed on computer to protect it from
getting viruses.
4. Mention few antivirus softwares.
Ans: K7, Kaspersky, Quickheal,Avast
Norton etc.,
5. What is Firewall?
Ans: Firewalls are computer systems that
protect computer when connected to
network.
6.What are Hackers and crackers?

2. Ans: Hackers are the persons who breaks
into other computer and changes the data
wantedly .Crackers are the persons who
breaks into others computer and do not
change the data wantedly.
7.What is Freeware?
Ans: Freeware is programming that is offered
at no cost and is a common class of small
applications available for downloading and use
in most operating systems
8. What is an operating system?
Ans: Operating system acts an interface
between the user and the computer
9. Give some examples of operating system.
Ans: Windows XP, Windows 7, windows 8,
windows 10 pro , Linux, Unix etc.,
10. Spellings
a) Operating System
b) Downloading
c) Firewall

3. d) Hackers
e) Crackers
f) Freeware
g) Antivirus