what is computer virus ? define types.
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Answer:
A computer virus is a type of malicious software that, when executed, replicates itself by modifying other computer programs and inserting its own code. When this replication succeeds, the affected areas are then said to be "infected" with a computer virus.
Virus writers use social engineering deceptions and exploit detailed knowledge of security vulnerabilities to initially infect systems and to spread the virus. The vast majority of viruses target systems running Microsoft Windows,employing a variety of mechanisms to infect new hosts, and often using complex anti-detection/stealth strategies to evade antivirus software. Motives for creating viruses can include seeking profit (e.g., with ransomware), desire to send a political message, personal amusement, to demonstrate that a vulnerability exists in software, for sabotage and denial of service, or simply because they wish to explore cybersecurity issues, artificial life and evolutionary algorithms.
Computer viruses currently cause billions of dollars' worth of economic damage each year,due to causing system failure, wasting computer resources, corrupting data, increasing maintenance costs, etc. In response, free, open-source antivirus tools have been developed, and an industry of antivirus software has cropped up, selling or freely distributing virus protection to users of various operating systems.As of 2005, even though no currently existing antivirus software was able to uncover all computer viruses (especially new ones), computer security researchers are actively searching for new ways to enable antivirus solutions to more effectively detect emerging viruses, before they have already become widely distributed.
The term "virus" is also misused by extension to refer to other types of malware.
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Answer:
what is virus?
virus is nothing but a piece of coding that enters your computer without your knowledge and infects it
types of virus :
1.boot sector virus : it harms the boot sector of the computer. removable media will be spreaded by this virus. i.e. hard discs will be infected.
2.direct action virus : this type of virus directly attacks the computer.
3.resident virus : this type of virus gets installed in computer and it is hard to identify this type of virus.
4.multipartite virus: this virus spreads in multiple ways as the name describes. it infects the boot sector and executable files (.bat , .com)
5.polymorphic virus: it is a type of viru which automatically changes it's code when it passes to a different machine.
6.overwrite virus: this type of virus will destroy the original code by overwriting the code.
7.spacefiller virus: it affects the system by changing the functionality of it. it can rewrite some particular codes.
so why is virus named as vital information under siege:
virus is namede vital information under siege because the vital information is getting seized by the computer.
cant we escape from these viruses:
we can escape these by installing antivirus in our computers such as avg antivirus and quickheal. these will protect your computer by acting as a firewall.