A green hat hacker is a beginner in the cybersecurity world; someone actively learning offensive security techniques through experimentation and study. Green hats are motivated to genuinely understand how attacks work. They represent the pipeline for future white hat ethical hackers and, with proper mentorship and training, become valuable assets in any security program.

The seven hacker hats are a classification system describing different hacker mindsets and motivations. White hats are ethical hackers authorized to test systems. Black hats are malicious attackers hacking for profit or sabotage. Gray hats probe systems without permission but often disclose findings responsibly. Green hats are beginners learning hacking skills. Red hats are vigilantes who attempt to hack back against criminals. Blue hats are external testers invited to assess systems before release. Purple hats are self-taught experimenters who learn through home labs and side projects.

A white hat hacker is an authorized security professional who tests systems with explicit permission, staying within agreed scope and rules of engagement. A black hat hacker operates without authorization, exploiting vulnerabilities for personal gain, sabotage, or notoriety. The key distinction is authorization and intent.