DENIALOFSERVICEATTACK
Denial-of-service attack
In computing, a denial-of-service attack or distributed denial-of-service attack is an attempt to make a machine or network 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 efforts to temporarily or indefinitely interrupt or suspend services of a host connected to the Internet.The above text is a snippet from Wikipedia: Denial-of-service attack
and as such is available under the Creative Commons Attribution/Share-Alike License.