What Is a Virus?
A computer virus attaches itself to a program or file
enabling it to spread from one computer to another, leaving infections as it
travels. Like a human virus, a computer virus can range in severity: some may
cause only mildly annoying effects while others can damage your hardware,
software or files. Almost all viruses are attached to an executable file, which
means the virus may exist on your computer but it actually cannot infect your
computer unless you run or open the malicious program. It is important to note
that a virus cannot be spread without a human action, (such as running an
infected program) to keep it going. Because a virus is spread by human action
people will unknowingly continue the spread of a computer virus by sharing
infecting files or sending emails with viruses as attachments in the email.
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