What is a computer virus? A computer virus is a type of malicious software (malware). When it is executed, it replicates itself by modifying other computer programs and inserting its own code. When this replication succeeds, the affected areas are then said to be "infected" with a computer virus.¹

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What harm do viruses cause?

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What can you do to protect your devices?

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Sources

¹ Wikipedia: Computer virus, URL: https://en.wikipedia.org/wiki/Computer_virus (last access: July 2019).

² TechQuickie: What's the Difference Between Viruses and Malware?, URL: https://www.youtube.com/watch?v=fKxuKWsA_JI&feature=youtu.be (last access: June 2019).