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A computer virus can be created maliciously by anyone wanting to harm computers or systems. They are hidden pieces of code that ride with different programs or applications and once activated they can spread like wildfire. Viruses are often found on documents or programs that have been downloaded from the Internet or distributed via email. The majority of countries believe that spreading and creating computer viruses is a crime.

In the world of computer viruses, there are a variety of different kinds of viruses that can affect a machine in different ways. Certain computer viruses depend on an application to start their work. Others are self-contained and are able to attack multiple systems without a host. A computer virus that makes use of host programs to infect computers is typically considered as a worm but those that don't employ the method of infection used through other programs are deemed to be viruses.

Certain viruses are able to begin infecting systems as soon they are discovered, while other remain undiscovered until a user is unaware of the code and executes it. The first computer virus was created in 1974 and behaved as a biological virus by rapidly multiplying itself and causing harm to the system. Stuxnet is an example of an extremely destructive computer virus. It was designed to destroy computerized centrifuges which were used to enrich the uranium.

The process of making viruses can be quite complex and not for those who are not experienced. It can be a fun way to test your computer programming skills. There are numerous resources that can show you how to create a virus if are willing and capable of putting into the effort.