A hacker is..., a person who enters computer systems without permission., A computer virus is..., a software program that causes problems in computers., A criminal is..., a person who breaks the law; for example, by stealing money., Junk e-mail is..., an advertisement you didn't request., An anti-virus program is..., a software program that tries to stop the spread of viruses., A ciberbully is..., a person who sends cruel and negative messages to another person online., An identity thief is..., a person who steals other people's personal information..

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