<p>Routers, computers, web cameras — they all connect to the internet. And they can be infected with malicious software that lets someone else take over. The device becomes a bot, essentially.</p><br/><p>A group of these devices networked together then becomes a botnet. And these botnets can then be used for nefarious purposes, like distributed denial of service attacks, without the device owners even knowing about it.</p><br/><p>Cybersecurity journalist Brian Krebs recently wrote about several large botnets including one called Kimwolf that compromised more than three million devices.</p>