does my computer have a virus

 

We'll start by looking at a typical definition of the word "virus." Merriam-Webster defines a computer virus as: "a set of instructions that is capable of reproducing itself and typically causes intentional damage to computing devices and programs." Essentially, that definition could apply to nearly any piece of software.

But when people talk about viruses on their computers, they're usually referring to software that can spread from one computer to another without the user's knowledge.

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