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A computer virus is a malicious program that is created by individuals who want to cause damage or disruption to computers and systems. They are hidden bits of code that attach themselves to other applications or programs, and when activated, spread like wildfire. Typically, viruses are found in a document or program downloaded via the internet or transmitted via email. The majority of countries believe that creating and spreading the virus on computers is illegal.
There are a variety of computer viruses that affect computers in different ways. Some computer viruses are dependent on an application for starting their work. Others are not dependent and can attack several systems without a host. Computer viruses that employ host programs to infect computers are typically called worms but those that do not employ this method of infection via other programs are known as viruses.
Certain viruses can infect a system immediately upon entry, whereas others are inactive and only be activated when the user executes the code. The first computer virus, created in 1974, and akin to biological viruses, grew rapidly and caused harm to the system. One example of a destructive virus is Stuxnet virus that was specifically created to destroy computerized centrifuges used to enrich uranium.
The process of creating viruses can be quite complex and is not suitable for those who are not experienced. However, it is a fun and interesting way to test your skills in computer programming languages and systems. There are a lot of resources that can teach you how to create a virus, if you are willing and are able to put in the effort.