What Is Computer Virus ?

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A computer virus is a malicious computer program that, when executed by an unsuspecting human, performs tasks that primarily include replicating itself and in some cases deploying a payload.

A decade or so ago, viruses were pretty simple. They got into a system and infected a file or two. It was a basic as ordering coffee when coffee was easy to order. “One coffee pleaseblack.”

Today, the catalog of viruses you have to defend yourself against is frighteningly complex. In fact, it’s become as complex as, well, ordering coffee.

“Looks like you’ve been infected by a dropper that’s put a Trojan on your system, which deployed a multi-partite that opened a backdoor and also infected the master boot record.”

Sounds like an order at Starbucks, don’t you think?

These days a discussion about a virus can actually occur without using the word virus because sometimes viruses are worms or Trojan horses, which are virus-like nasties that act a little different than their infectious cousins.

Why are they called computer viruses? Well, because they have similar characteristics to biological viruses that...

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