Honeypot
A decoy system deployed to attract attackers so their behaviour can be observed and indicators collected.
A honeypot is a system, service, or address deliberately exposed to attract malicious activity. Low-interaction honeypots emulate vulnerable services (SSH, Telnet, RDP) to collect credentials and payloads; high-interaction honeypots run real operating systems inside isolated environments to capture full intrusion chains. Honeypot data feeds threat intelligence: shared IP reputation lists, malware sample collection, and early warning of new exploit campaigns. Spam honeypots (also called spam traps) play a similar role for email reputation.