A botnet refers to a type of
bot running on an
IRC network that has been created with a
trojan. When an infected computer is on the
Internet the bot can then start up an IRC
client and connect to an IRC
server. The Trojan will also have been coded to make the bot join a certain
chat room once it has connected. Multiple bots can then join in one channels and the person who has made them can now spam IRC chat rooms, launch huge numbers of
Denial of Service attacks against the IRC servers causing them to go down.