IRC to put it simply, IRC is like a normal chat system, except instead of chat (which doesn't happen as everyone is
either idle or a bot the fbi), the main activity of IRC is op-wars and denial of service attacks. Ops are people who kick and ban those from a room who suck up the least (the non-ops don't have that so they denial of service attack them instead), which causes the banned users to retaliate by DDoSing the ops and the IRC network and ChanServ, then gaining ops on a split.
Unsurprisingly, the existence of channels (to make communication a bit easier) created potential for vast amounts of drama, which quickly transformed from being potential to actual drama, human beings being what they are beans in a pot. Channel and network drama happens at an exponential rate of growth, but since anything rarely goes past words in the IRC protocol, it's entirely harmless and pointless. Stupid drama. IRC also is used to transfer two very different types of important communication.