To Initiate a Denial­of­service Attack, a Tiny Program Is Downloaded

Short Answer

To initiate a denial­of­service attack, a tiny program is downloaded surreptitiously from the attacker's computer to dozens, hundreds, or even thousands of computers all over the world. Based on a command by the attacker or at a preset time, the botnet computers, called , go into action, each sending a simple request for access to the target site again and again.