Cybersecurity information sharing involves organizations collaborating and exchanging relevant data on cybersecurity threats and incidents. It helps in building a collective defense by providing insights into the threat landscape and enabling participants to act proactively to protect their systems. A Threat intelligence feed delivers timely information about potential threats to an organization and is thus the correct answer. In contrast, Vulnerability databases catalog known vulnerabilities but do not offer real-time threat data. Incident response services are activated after a cybersecurity incident has occurred. SOAR platforms are used for security automation, orchestration, and response but are not primarily focused on sharing information between organizations.