Glossary
Whatis reach?
Reach is the number of individual accounts that saw a piece of content at least once. It differs from impressions, which counts every view including repeats by the same person.
All 118 terms
Reach is the headline number on every report because it is the largest one available. Treat it as the size of the room rather than the size of the result: it tells you how many people had the opportunity to notice, and nothing about whether any of them did.