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There are also hackers who hack into systems to bring awareness to the security flaws. If these flaws were to be discovered by a "bad" hacker, it could lead to a huge wave of panic caused by potentially stolen data. They could also insert a virus into the system. Check out chapter 81 if you want to learn a bit more about viruses. Depending on the skill level of the programmer, a virus can do basically anything that is possible in a digital environment from locking/deleting data to getting you mom's credit card information.