The VIRUS

"A program that can infect other programs by modifying them to include a slighty 
altered copy of itself. A virus can spread throughout a computer system or network 
using the authorization of every user using it to infect their programs. Every programs 
that gets infected can also act as a viral infection that grows " 
(Fred Cohen) 
The first time the term "virus" is used by Fred Cohen in 1984 in 
United States. Computer virus called "virus" because it has some 
fundamental similarities with the virus in the medical term (biological viruses). 
Computer viruses can be defined as a normal computer program. But 
have a fundamental difference with other programs, the virus 
made to infect other programs, change, manipulate 
even merusaknya. There is a need to note here, the virus will only infect 
triggered when the program or programs that have been infected earlier executed, disinilah 
differences with the "worm". This study will not be because the worm will 
divert us from the discussion on this virus.