"So, to start with his question, Botnets are networks of Windows
PC, which have been taken over by malware programs. While it's
theoretically possible that a Mac or a Linux desktop PC could get a
botnet malware bug, in practice, their better security makes them
harder targets for botnet creators so they avoid them.
"Your computer typically gets infected by botnet malware by a
virus or worm. You get these by opening up an infected attachment
or by visiting an infected Web site. Most modern anti-viral
programs like AVG, Norton Anti-Virus, or Kaspersky Anti-Virus, will
keep your machine safe from these attackers. If, that is, you keep
your security programs up-to-date. Stale anti-viral software is
worst than useless."
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