Blue Team

A Blue Team is a group of cybersecurity professionals responsible for defending an organization's systems and networks against cyberattacks.

Blue Teams focus on monitoring, detecting, analyzing, and responding to security incidents and threats in real-time, working to maintain the security posture of their organization's digital infrastructure.

Blue Team activities typically include continuous network monitoring, log analysis, incident response, threat hunting, vulnerability assessments, and the implementation of security controls and countermeasures. They use various security tools such as Security Information and Event Management (SIEM) systems, intrusion detection systems, endpoint detection and response platforms, and other defensive technologies to identify and mitigate potential threats.

The term originates from military exercises where opposing forces are designated as "red" (attackers) and "blue" (defenders). In cybersecurity contexts, Blue Teams often work in conjunction with Red Teams—ethical hackers who simulate attacks to test defensive capabilities. This collaborative approach, sometimes called "Purple Team" exercises, helps organizations improve their overall security posture by identifying weaknesses and validating defensive strategies through controlled testing scenarios.