Presented By
Gaurav Sharma

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What is a virus ?
Viruses range from the harmless programs displaying a character on your screen to the malicious codes which go on to format your entire hard-disk
The difference between a computer virus and other programs is that viruses are designed to self-replicate (make copies of them). They self replicate without the knowledge of the user.
Classification of viruses
 General classification of the virus.
 Behavioral classification of the virus
GENERAL CLASSIFICATION OF VIRUSES
BEHAVIOURAL CLASSIFICATION OF VIRUSES
In addition to the general classification ,viruses can also be classified according to the following behavior patterns exhibited by them:
 Nature of attack.
 Deception techniques employed.
 Frequency of infection.
How Does a Computer Get a Virus?
On downloading files from the Internet.
On opening an e-mail attachment.
On copying programs or files from any other infected computer.
SYMPTOMS OF A VIRUS INFECTION
Viruses by nature are designed to spread unnoticed as much as possible; before carrying their payload (that is, before carrying out their activities). However, before those happen, there are a variety of symptomatic indications
Some General Tips on avoiding virus infections:
 Install anti-virus software from a well-known, reputable company, UPDATE it regularly, and USE it regularly.
 Virus scan any new programs or other files that may contain executable code before you run or open them.
 Do regular backups. Some viruses and Trojan horse programs will erase or corrupt files on your hard drive.
 If your E-mail or news software has the ability to automatically execute
 JavaScript, Word macros, or other executable code contained in or attached to a message, disable this feature.
CONCLUSION
From here, we conclude that we have to take care while using different types of external data storage devices like CDs and floppy disks, the sentence is
“PREVENTION IS ALWAYS BETTER THAN CURE”.
Before inserting or extracting some data from the devices first of all, we have to scan it properly with the help of upgraded and standard anti-virus software.