Red Team vs Blue Team vs Purple Team, Explained
Once an organisation is serious about security, "ethical hacker" splits into more specific roles. Red, blue, and purple team are the most common labels, and understanding what each actually does clears up a lot of confusing job titles.
Updated 2026-08-06
Two roles playing opposite sides, on purpose
A red team plays the attacker, authorised to simulate real intrusion attempts against an organisation to find weaknesses before real criminals do. A blue team plays the defender, responsible for detecting, responding to, and stopping those simulated attacks in real time, exactly as they would a genuine incident. Both roles are entirely legal and pre-arranged — the "attack" is a rehearsal, not a real threat.
Why running them separately has a real weakness
A classic red-versus-blue exercise runs like a genuine incident: the red team tries to get in undetected, the blue team tries to catch and stop them, and afterward everyone compares notes. This is valuable, but it has a real limitation — the two teams often work in isolation until the very end, missing the chance to learn from each other in real time while the exercise is actually happening.
Purple team: making sure the lesson actually lands
A purple team is not a third army — it is the function of deliberately connecting red and blue, sometimes as dedicated people, sometimes as a shared process both teams follow. Purple teaming means the attacker explains techniques as they use them and the defender explains what they did or didn't catch, turning the exercise from a one-time test into a continuous feedback loop that improves detection and response together.
The goal was never "who wins"
Framing red vs blue as a competition misses the point. The organisation wins when the exercise produces concrete improvements to detection and response — regardless of which side technically "won" on a given day.
Which one is the right starting point for you
- If offence — finding and proving weaknesses — sounds appealing, red team skills build directly on penetration testing and CTF practice.
- If detection and response — noticing something is wrong and reacting fast — sounds appealing, blue team work centres on monitoring, log analysis, and incident response.
- Purple team roles usually come later in a career, once you understand both sides well enough to translate between them.
- Many practitioners deliberately spend real time on both sides early on, since each perspective makes the other stronger.