Computer virus

You might heared about virus causing health problems such as fever and other dangerous diseases. Viruses in common language are harmful germs that cause damage to anyone they attack.
Have you heard about viruses attacking computer systems? These viruses are different from the harmful viruses that attack us.

A VIRUS that attacks a computer is actually a computer program that is deliberately written by bad guys called "VIRUS PROGRAMMERS". A VIRUS PROGRAM is not always harmful ; or any program that causes harms to a computer system is not always a virus.

A computer virus in real terms is a program that can make a copy of itself . It means that the program or virus can copy itself to different locations on the same computer or try to infect different computers automatically.

HARMS CAUSED BY COMPUTER VIRUSES-

Do you know that the majority of the virus programs are harmless? Their main purpose is to irritate the computer users instead of causing damages.
These viruses are written by some people just for fun. But other viruses are malicious and can be very harmful to a computer system. They can fill up the discs space of a computer by coping itself endless times. They can modify or corrupt important files, delete information from files, steal your account and password and send them to other people through internet.

SYMPTOMS OF A VIRUS INCLUDES--

computer lockups, data loss, unusual messages and reduced computer performance.

HISTORY OF COMPUTER VIRUSES--

Traditional computer viruses emerged in the 1980s. In 1982 ,rich secrenta, created a virus names "ELK CLONER" that attached itself to the apple DOS 3.3 operating system and spread by floppy disk.
The first PC virus was a voot sector virus called brain. It was created in 1986 by two brothers , Basit and A.F. Alvi. The brothers created the virus to prevent pirated copies of software they had written.
Since the mid 1990s macro viruses have become common. Most of these viruses are written in the scripting languages for Microsoft programs such as MS Word and MS Excel. These viruses spread in Microsoft Office.
Nowadays the most common means of virus infection is through instant messaging or internet chat software.

E-mails are the biggest are the biggest means to spread viruses worldwide.

TYPES OF COMPUTER VIRUSES--

There are many types of viruses and different people and different people may describe them in different ways. You will now learn some of the specific categories of viruses:
1.BOMBS: These are the viruses which activate themselves after a specific time period and cause damage to the computer system
2.BOOT SECTOR VIRUSES:The boot sector is rhe area of a hard disk or floppy disk that stores valuable information. Boot sector viruses affect this area and cause damages. These are very harmful viruses.
3.E-MAILS VIRUSES:These viruses transmit through e-mails and the attachments file. When the person opens the attachment file, the virus copies itself to his or her computer and causes damage.
4.TORJANS: These viruses at first appear to be friendly but they are very malicious programs which are used to steal information from your computer. They can be of of any type. Even some computer games can be torjans viruses.
5.WORMS: A worm is a malicious program that duplicates itself. They eventually fill up the disks space with copies of itself and thereby make a computer system to work very slow. The most common and useful way to protect your computer from viruses is to use an antivirus program.


By sudhanshu total