Intrusion Detection System, that is IDS, is a kind of computer system which indentifies and responds to the violation of policies of computer security and network security.

• 入侵检测系统(Intrusion Detection System，简称IDS)是近年来网络安全研究的热点，它是指用于对计算机和网络上的违反安全策略的行为进行识别和响应的系统。