Recently the Blizzard servers have suffered from DDOS attacks. For several hours today, they have repeatedly seen WoW realms targeted and tasks offline by the attacker (s).
Of course many people ask how this happens and whether it will continue for longer. Blizzard responded in a fierce way. not against the players, but against the “virtual terrorists,” according to Blizzard
But what exactly is a Ddos attack? A short description of what comes from Wikipedia
In computing, a denial-of-service attack (DoS attack) is a cyber-attack in which the perpetrator seeks to make a machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting services of a host connected to the Internet. Denial of service is typically accomplished by flooding the targeted machine or resource with superfluous requests in an attempt to overload systems and prevent some or all legitimate requests from being fulfilled.
In a distributed denial-of-service attack (DDoS attack), the incoming traffic flooding the victim originates from many different sources. This effectively makes it impossible to stop the attack simply by blocking a single source.
A DoS or DDoS attack is analogous to a group of people crowding the entry door of a shop, making it hard for legitimate customers to enter, thus disrupting trade.
Criminal perpetrators of DoS attacks often target sites or services hosted on high-profile web servers such as banks or credit card payment gateways. Revenge, blackmail and activism can motivate these attacks.