Glossary
Reach
The number of unique users exposed to an advertisement or campaign.
Media BuyingFoundationSource: MRC
Definition
The number of unique users exposed to an advertisement or campaign.
Why it matters
Reach measures breadth of exposure, distinct from impressions (which count repeat exposure too) — the two get conflated constantly in casual reporting.
Key consideration
A campaign can show a huge impression count against a small reach number, meaning the same small audience is being hit repeatedly — check frequency alongside reach before assuming broad exposure.
Related terms
Practitioner notes
Add a note
This glossary gets stronger with every contribution — add what you know about Reach in practice, or flag what needs fixing. Notes post immediately and are visible to everyone.
No notes yet.