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Red, Blue & Purple Teaming

Technology Fundamentals

Red, Blue & Purple Teaming

1 min readPublished 22 Jul 2026

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Security testing is often framed as teams: red attacks, blue defends, and purple brings them together to improve faster.

Interactive explainer

Red, Blue & Purple Teaming

Offence and defence, working together.

1Red team2Blue team3Purple = collaboration4Measurable improvement

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Red team

Attack.

The red team simulates real adversaries — penetration testing and adversary emulation — to find weaknesses before genuine attackers do.

Check your understanding

1. What does a red team do?

2. What is purple teaming?

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Red, Blue & Purple TeamingSecurity Operations CompTIA PenTest+
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The teams

  • Red team — simulates real adversaries (penetration testing, adversary emulation) to find gaps before attackers do.
  • Blue team — the defenders: the SOC, incident response and threat hunting.
  • Purple teaming — not a separate team but a collaborative approach: red shares techniques, blue verifies detection and response, and both improve together in real time.

The goal isn't to 'win' but to measurably improve detection and response, often mapped to MITRE ATT&CK. Purple teaming turns a one-off test into continuous improvement — mature, effective and increasingly expected.

Interview Intelligence

How this topic actually shows up in interviews — and how to demonstrate you understand it.

Why employers ask about this

Understanding offensive and defensive collaboration shows mature, rounded security thinking.

Technical questions
Explain red, blue and purple teaming.+

Red attacks, blue defends, purple has them collaborate so detection and response measurably improve.

Behavioural questions
Tell me about collaborating with a team you might see as opposition.+

Show shared goals and mutual improvement over 'winning'.

Real-world scenarios
“A red team test found gaps but nothing improved afterwards.”+

Expected answer: Adopt purple teaming — have red and blue collaborate to build and validate detections for each technique used.

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Employability Intelligence

Where this knowledge takes you — the jobs, skills and certifications it feeds into.

Relevant roles
Penetration TesterSOC AnalystSecurity Engineer
Skills you're proving
Red/blue/purple teamingAdversary emulationDetection improvement
Recommended certifications
CompTIA PenTest+GIAC GPEN / GCIH
Career progression

Cyber Fundamentals → Red/Blue/Purple team roles.

What employers expect

That you understand core security principles and can apply them to real risks, controls and incidents.

Frequently asked questions

What is the difference between a red team and a blue team?

The red team simulates attackers to find weaknesses; the blue team defends, detects and responds.

What is purple teaming?

A collaborative approach where red and blue work together so detections and responses improve in real time.

Why is purple teaming valuable?

It turns adversarial testing into measurable, continuous improvement of detection and response.

Related guides

Cyber Security Fundamentals: Principles, Threats, Defence & OperationsSecurity Principles: CIA, Defence in Depth & Zero TrustRisk Management & GovernanceThreat Actors & Threat Intelligence

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