DDoS (acronym for Distributed Denial of Service) attack is an situation on a network in which an attacker floods a server with incoming messages at such a tremendous rate that the server cannot handle the load and is forced to shut down.
a common online assault that aims to overwhelm network bandwidth using a flood of data, to prevent access to servers
a destructive assault intended to cripple or crash a Web application and its infrastructure
a form of denial-of-service (DoS) attack, where more than one traffic generator (a zombie) directs traffic to a targeted URL
an attack on a computer system or network that causes a loss of service to users, typically the loss of network connectivity and services by consuming the bandwidth of the victim network or overloading the computational resources of the victim system
an attempt to disrupt the service of a computer network and/or company website by overwhelming the processing capacity of the system or by flooding the bandwidth of the business
a type of denial of service attack in which an attacker uses malicious code installed on various computers to attack a single target
Distributed Denial of Service Attack. These attacks are more intense and damaging than DoS attacks. In DDoS attacks, multiple machines unknowingly participate in an attack against a single host target.