A computer program with the ability to modify other programs usually to the determent of the computer system.
A computer virus is a self-replicating program contain code that explicitly copies itself and can "infect" other programs by modifying them or their environment such that a call to an infected program implies a call to a (possibly evolved) copy of the virus. More one viruses.
Virus ia a software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer: "a true virus cannot spread to another computer without human assistance'.
In computer security technology, a virus is a self-replicating program that spreads by inserting copies of itself into other executable code or documents (for a complete definition: see below. Thus a computer virus behaves in a way similar to a biological virus, which spreads by inserting itself into living cells. Extending the analogy, the insertion of the virus into a program is termed infection, and the infected file (or executable code that is not part of a file) is called a host....
A computer virus is a self-replicating computer program written to alter the way a computer operates, without the permission or knowledge of the user. Though the term is commonly used to refer to a range of malware, a true virus must replicate itself, and must execute itself. The latter criteria are often met by a virus which replaces existing executable files with virus-infected copy. While viruses can be intentionally destructive - destroying data, for example-some viruses are benign or merely annoying.
A computer virus is a program or software with a set of coded instructions to carry out the desired disorder and destruction, as also to replicate it. Though non-living and artificially created, the computer virus has marked similarities with its biological counterpart, and hence the name. Both forms of viruses contain coded instructions to carry out a set of activities, when certain specified conditions are met. Each computer virus has it specific signature. Both of them invade and replicate only in a host. Both of the can be detected and "vaccines" can be prepared.
