The terms red team, blue team, and purple team describe different approaches to security testing and organisational defence improvement. Understanding what each does — and when each is appropriate — helps organisations invest in the right activity for their maturity level.
Red Team
A red team conducts adversary simulation — emulating the tactics, techniques, and procedures of real-world attackers to test whether an organisation's defences work against a realistic threat. Unlike a penetration test, which aims to find as many vulnerabilities as possible, a red team engagement is objective-based: can the team achieve a specific goal (access a database, exfiltrate data, reach a production server) while testing whether the organisation detects and responds to the activity?
Red team engagements typically combine multiple attack vectors: technical exploitation, social engineering (phishing, vishing), physical security testing, and supply-chain attack simulation. They test people and processes alongside technology.
**Best for:** Mature security programs that want to validate detection and response capabilities against realistic adversary tactics.
Blue Team
The blue team is the defensive side — the organisation's security operations team responsible for detecting, responding to, and containing attacks. Blue team activities include security monitoring (SOC operations), incident response, threat hunting, and defensive tool management.
While not a "test" in the same way, blue team capabilities are often assessed through exercises and simulations — and red team engagements specifically test whether the blue team detects the simulated attack.
Purple Team
Purple teaming is a collaborative exercise where the red and blue teams work together — the red team executes attack techniques while the blue team observes and tunes their detection capabilities in real time. The goal is improvement rather than assessment: the blue team learns to detect specific attack patterns, and detection coverage is systematically expanded.
Purple team exercises are highly effective for building defensive capability, but they don't provide the realistic assessment of an unannounced red team engagement.
Where Penetration Testing Fits
Penetration testing sits before red teaming in the maturity progression. An organisation that hasn't done thorough penetration testing should start there — finding and fixing technical vulnerabilities before testing whether attacks are detected. Red teaming an environment with known unpatched vulnerabilities produces obvious findings without testing the question that matters.
How Simuna Infosec Helps
We deliver both penetration testing and red team assessments and advise honestly on which is appropriate for your maturity level. For most organisations, rigorous VAPT with our dual-round verification model is the right starting point. For organisations with mature defences that want to test their detection and response, we conduct full-scope red team engagements.