Reach is the number of unique individuals who have seen your content, ad, or message within a defined period. Unlike impressions, which count every exposure including multiple views by the same person, reach counts each person only once regardless of how many times they were exposed. This makes reach the more accurate measure of how many distinct people your content accessed.

In B2B demand generation, reach matters because it defines the actual size of the audience your campaign touched. A campaign with high impressions but low reach is talking to a small audience repeatedly, which drives frequency fatigue rather than broad awareness. A campaign with high reach is genuinely extending your brand's presence among new potential buyers.

Reach is most strategically relevant for account-based marketing and brand campaigns where the goal is to ensure a defined set of target accounts and buying committee members have been exposed to your brand before outbound contact. High reach within your target account list, before cold outreach begins, meaningfully improves outbound response rates because recipients have prior context.

Analytics terms are useful only when they change a decision. A metric can look sophisticated and still be low value if nobody knows how it is calculated, which segment matters, or what action should follow when it moves. It usually becomes more useful when it is defined alongside Impressions, Frequency, and Engagement.