Final answer:
Themis, Cohort, and Multi-click are intrusion detection systems used in cybersecurity. Themis uses a combination of signature-based and anomaly-based approaches, Cohort is a machine learning-based IDS, and Multi-click is used for click fraud prevention.
Step-by-step explanation:
Themis, Cohort, and Multi-click are intrusion detection systems (IDS) used in cybersecurity.
Themis uses a combination of signature-based and anomaly-based approaches to identify and prevent cyber threats. It analyzes network traffic, detects patterns that indicate potential attacks, and alerts security administrators.
Cohort is a machine learning-based IDS that uses algorithms to identify malicious activities on a network. It can detect and respond to various types of attacks, such as malware infections and unauthorized access attempts.
Multi-click is a technique used to prevent click fraud in online advertising. It analyzes user behavior and identifies patterns that indicate fraudulent clicks, helping to protect advertising budgets.