--- title: PII (Personally Identifiable Information) - Definition | RGM® Glossary url: https://realgrowthmatters.com/glossary/pii-personally-identifiable-information/ updated: 2026-06-10 source_html: https://realgrowthmatters.com/glossary/pii-personally-identifiable-information/ --- Growth Glossary — Definition SHT PII-PERSONALLY # PII (Personally Identifiable Information) Data identifying specific person A working definition from the RGM marketing glossary. Data identifying specific person Term : PII (Personally Identifiable Information) Field : Audience & Privacy Category : Audience & Privacy ## Definition in plain terms Read that twice.PII (Personally Identifiable Information) is an audience or privacy concept. Fix what it covers before the team debates tactics, and the rest of the conversation gets easier. Data identifying specific person As a audience & privacy term, PII (Personally Identifiable Information) means an audience or privacy concept. Settle what it covers before the planning starts. ## How it works Read that twice.PII (Personally Identifiable Information) is no fixed dial. How it behaves depends on your audience, your channel mix, and the strategy around it. Think of PII (Personally Identifiable Information) as context-bound. A small shop reads it simply; an enterprise reads it with more nuance. That is normal -- PII (Personally Identifiable Information) is shaped by audience and channel mix. Read PII (Personally Identifiable Information) without care and the plan wobbles; be precise and the read holds. Keep the order simple: define PII (Personally Identifiable Information) for your context, then decide how to act. Reverse it and the budget chases a number nobody agreed on. Worth a slow read. ## When teams use it One idea, plainly put.Use PII (Personally Identifiable Information) when it changes a choice. If it is not driving a decision, it is vocabulary, not leverage. PII (Personally Identifiable Information) matters at the point of a decision. In audience & privacy, three moments come up again and again. Outside them, PII (Personally Identifiable Information) is reference material. 1. **Setting budget.** PII (Personally Identifiable Information) marks where added spend will work hardest. 2. **Choosing a metric.** PII (Personally Identifiable Information) tells you if the read reflects real effect. 3. **Comparing options.** PII (Personally Identifiable Information) adjusts a compare so the gap is honest. ## A concrete walk-through Hold that thought.To make PII (Personally Identifiable Information) concrete, the case below uses Sephora and figures from public reporting plus RGM analysis. Take Sephora. During a consented-audience rebuild, the team made PII (Personally Identifiable Information) the deciding input, not an afterthought. They set a baseline first, agreed one definition of PII (Personally Identifiable Information), and only then read the result: match rates held near 70% after ATT. The number matters less than the order. The numbers behind PII (Personally Identifiable Information) -- illustrative only, RGM analysis | Stage | The step taken | Why it mattered | | Baseline | Logged where PII (Personally Identifiable Information) stood before the test. | A fixed point of truth. | | Define | Fixed one meaning of PII (Personally Identifiable Information) for the test. | A shared definition up front. | | Act | A consented-audience rebuild — one variable. | One change, a clean read. | | Result | Match rates held near 70% after ATT | An outcome you can trust. | Treat the PII (Personally Identifiable Information) figures as illustrative, labeled RGM analysis. Reuse the sequence, not the digits. ## Failure modes to watch Keep this in mind.Teams slip on PII (Personally Identifiable Information) in four familiar ways. Each makes a soft assumption look like a precise number. - **One blanket rule.** Applying PII (Personally Identifiable Information) the same way everywhere. Split it by audience, channel, and business model. - **No context.** Reporting PII (Personally Identifiable Information) with no baseline. A bare number cannot be judged. - **Wrong target.** Treating PII (Personally Identifiable Information) as the goal. The goal is the outcome it predicts. - **Apples to oranges.** Comparing PII (Personally Identifiable Information) across firms raw. Adjust for pricing and cycle before you read it. ## Quick answers What does PII (Personally Identifiable Information) mean? Data identifying specific person Settle what PII (Personally Identifiable Information) covers first; the strategy follows from there. What makes PII (Personally Identifiable Information) worth knowing? PII (Personally Identifiable Information) matters because vague vocabulary breaks strategy. A precise, shared definition keeps a team aligned. Where does PII (Personally Identifiable Information) get used? PII (Personally Identifiable Information) informs a decision -- most often a budget, a metric choice, or a comparison. The Sephora example above shows the pattern. Where do teams slip up on PII (Personally Identifiable Information)? Chasing PII (Personally Identifiable Information) as a goal and benchmarking it raw. Both bury the real trade-off underneath. Where can I learn more about PII (Personally Identifiable Information)? Begin with the linked terms below, then study Apple's App Tracking Transparency, plus server-side tagging. What does PII (Personally Identifiable Information) mean? : Data identifying specific person Settle what PII (Personally Identifiable Information) covers first; the strategy follows from there. What makes PII (Personally Identifiable Information) worth knowing? : PII (Personally Identifiable Information) matters because vague vocabulary breaks strategy. A precise, shared definition keeps a team aligned. Where does PII (Personally Identifiable Information) get used? : PII (Personally Identifiable Information) informs a decision -- most often a budget, a metric choice, or a comparison. The Sephora example above shows the pattern. ### Related guides ### Related terms