拒绝服务攻击（DoS 攻击）或分布式拒绝服务攻击（DDoS 攻击）是试图使计算机资源对其目标用户不可用。尽管 DoS 攻击的实施手段、动机和目标可能有所不同，但它通常由一个或多个人共同努力来阻止 Internet 站点或服务有效或完全、暂时或无限期地运行。 DoS 攻击的实施者通常会针对托管在知名 Web 服务器（例如银行、信用卡支付网关，甚至根名称服务器）上的站点或服务。该术语通常用于计算机网络，但不限于此领域，例如，它也用于 CPU 资源管理。
A denial-of-service attack (DoS attack) or distributed denial-of-service attack (DDoS attack) is an attempt to make a computer resource unavailable to its intended users. Although the means to carry out, motives for, and targets of a DoS attack may vary, it generally consists of the concerted efforts of a person or people to prevent an Internet site or service from functioning efficiently or at all, temporarily or indefinitely. Perpetrators of DoS attacks typically target sites or services hosted on high-profile web servers such as banks, credit card payment gateways, and even root nameservers. The term is generally used with regards to computer networks, but is not limited to this field, for example, it is also used in reference to CPU resource management.
One common method of attack involves saturating the target machine with external communications requests, such that it cannot respond to legitimate traffic, or responds so slowly as to be rendered effectively unavailable. In general terms, DoS attacks are implemented by either forcing the targeted computer(s) to reset, or consuming its resources so that it can no longer provide its intended service or obstructing the communication media between the intended users and the victim so that they can no longer communicate adequately.
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谷歌！
查看并阅读：http://en.wikipedia.org/wiki/Denial-of -service_attack
另请参阅http://en.wikipedia.org/wiki/Distributed_denial_of_service_attacks_on_root_nameservers
GOOGLE!
Check out and read: http://en.wikipedia.org/wiki/Denial-of-service_attack
See also http://en.wikipedia.org/wiki/Distributed_denial_of_service_attacks_on_root_nameservers
DDOS 代表分布式拒绝服务
DDOS stands for Distributed Denial Of Service