Popular DDoS attacks include: TFN, TFN2k, Trin00, Stacheldraht, and FunTime Apocalypse. Also named smurfing.

A DDoS attack consists of pinging a broadcast server with a forged IP signature. The broadcast server then sends that packet to its minions (other servers with the DDoS software installed), and they in turn ping the IP that was forged. This floods the computer being attacked with ping requests, which brings down the network it's on, and/or uses up system resources, and/or knocks the computer off of the internet.