A true virus can only spread from one system to another (in some form of executable code) when its host is taken to the target computer for instance, when a user sent it over the Internet or a network, or carried it on a removable media such as CD, DVD or USB drives. The term virus is also commonly but erroneously used to refer to other types of malware, Adware and Spyware programs that do not have reproductive ability.

Just replicate themselves to propagate further harm.Ĭomputer virus has the ability to copy itself and infect the system.

Delete files inside the system into which viruses enter.

Display a message to prompt an action which may set of the virus.

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Viruses can often spread without any readily visible symptoms.

Viruses may also contain malicious instructions that may cause damage or annoyance, the combination of possibly Malicious Code with the ability to spread is what makes viruses a considerable-concern. Viruses spread themselves, without the knowledge or permission of the users, to potentially large numbers of programs of many machines.Ī computer virus passes from computer to computer in a similar manner as a biological virus passes from person to person.

Computer virus is a program that can “infect” legitimate programs by modifying them to include a possibly “evolved” copy of itself.

Dns worm virus