/dɪˈnaɪəl ʌv ˈsɜːrvɪs/ – noun
Definition: một hành vi tấn công nhằm làm cho dịch vụ trở nên không khả dụng cho người dùng bằng cách làm quá tải hệ thống hoặc gây ra sự cố.
A more thorough explanation: an illegal attempt to cause a computer system to crash by sending large amounts of data to it from many different sources at the same time
Example: Police have arrested a man they believe was involved in the denial-of-service attacks directed at PlayStation Network and Xbox Live.