Learn about Intrusion Detection Systems (IDS) in this comprehensive 51-minute video lecture from Prof Bill Buchanan OBE's "Introduction to Security and Network Forensics" series. Explore various IDS types, capture methods, and tools like Snort. Examine policy violations, including Napster, QuickTime, and SMTP examples. Dive into network security concepts such as port scans, ping sweeps, and account scans using Nmap. Understand user profiling, honeypots, and intrusion prevention techniques. Gain valuable insights into network forensics and security practices essential for IT professionals and cybersecurity enthusiasts.