A
botnet or robot network is a group of computers running a computer
application controlled and manipulated only by the owner or the software
source. The botnet may refer to a legitimate network of several
computers that share program processing amongst them.
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Usually
though, when people talk about botnets, they are talking about a group
of computers infected with the malicious kind of robot software, the
bots, which present a security threat to the computer owner. Once the
robot software (also known as malicious software or malware) has been
successfully installed in a computer, this computer becomes a zombie or a
drone, unable to resist the commands of the bot commander.