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This is an accepted version of this page This is the latest accepted revision, reviewed on 2 February 2025. Computer program that modifies other programs to replicate itself and spread Hex dump of the Brain virus, generally regarded as the first computer virus for the IBM Personal Computer (IBM PC) and compatibles A computer virus is a type of malware that, when executed, replicates itself by ...
A backdoor is a broad term for a computer program that allows an attacker persistent unauthorised remote access to a victim's machine often without their knowledge. [38] The attacker typically uses another attack (such as a trojan , worm or virus ) to bypass authentication mechanisms usually over an unsecured network such as the Internet to ...
An example of a macro virus is the Melissa virus which appeared in March 1999. When a user opens a Microsoft Word document containing the Melissa virus, their computer becomes infected. The virus then sends itself by email to the first 50 people in the person's address book. This made the virus replicate at a fast rate. [4]
November: The term "virus" is re-coined by Frederick B. Cohen in describing self-replicating computer programs. In 1984 Cohen uses the phrase "computer virus" (suggested by his teacher Leonard Adleman) to describe the operation of such programs in terms of "infection". He defines a "virus" as "a program that can 'infect' other programs by ...
This glossary of geography terms is a list of definitions of terms and concepts used in geography and related fields, including Earth science, oceanography, cartography, and human geography, as well as those describing spatial dimension, topographical features, natural resources, and the collection, analysis, and visualization of geographic ...
Depending on the virus, a variety of genetic changes can occur in the host cell. In the case of a lytic cycle virus, the cell will only survive long enough to the replication machinery to be used to create additional viral units. In other cases, the viral DNA will persist within the host cell and replicate as the cell replicates.
In 1983, the term "computer virus" was coined by Fred Cohen in one of the first ever published academic papers on computer viruses. [10] Cohen used the term "computer virus" to describe programs that: "affect other computer programs by modifying them in such a way as to include a (possibly evolved) copy of itself."
A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. [1] Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea. [2] [3] Viruses are found in almost every ecosystem on Earth and are the most numerous type of biological entity.