IDS stands for Intrusion Detection System, a security technology that monitors network traffic and system activities to detect and prevent unauthorized access, misuse, and malicious attacks. It works by analyzing data packets and comparing them to known patterns of malicious behavior, such as malware or hacking attempts. IDS can be either network-based, monitoring traffic on a network, or host-based, monitoring activities on a specific device. It plays a crucial role in maintaining the integrity and confidentiality of sensitive information, making it an essential tool for cybersecurity.