Security glossary
What is a data broker?
A data broker is a company that collects, combines, and sells personal-data profiles from multiple sources.
Last reviewed: 2026-05-23
In plain English
Broker profiles can include contact details, location history, household links, and marketing attributes.
Broker data can make phishing and impersonation messages look more convincing.
Breach data and broker data often overlap, which can increase downstream targeting risk.
Real-world example
A broker profile links your email, old address, and household members, then that context appears in a scam message.
What you should do
- Start with a scan to prioritize which vectors need action first.
- Use verified opt-out routes and keep evidence of each request.
- Recheck listings over time because records can return.
Related terms
What is identity theft risk after a breach?
Identity theft risk means exposed personal details could be used to impersonate you for fraud, account creation, or social scams.
What is social engineering?
Social engineering is psychological manipulation used to make people share information or approve harmful actions.
Data breach vs data leak: what is the difference?
A breach usually means unauthorized access. A leak usually means data became exposed through poor controls or accidental disclosure.