How do you define the term "reach" in the context of Facebook Ads?

In the context of Facebook Ads, "reach" refers to the number of unique people who have seen an ad at least once during a specific time period. Reach is a measure of the size and uniqueness of the audience that has been exposed to an ad.

Reach is different from impressions, which is the total number of times an ad has been displayed, regardless of whether it was seen by the same person or not. For example, if an ad is shown to the same person twice, it counts as two impressions but only one reach.

Facebook Ads provides reach data at the campaign, ad set, and ad levels, as well as at the audience level. Reach data can help advertisers understand the size and composition of their audience, as well as the frequency and duration of their ad exposure.

Reach is an important metric for Facebook Ads because it helps advertisers measure the effectiveness of their targeting and frequency strategies. By monitoring reach, advertisers can ensure that their ads are being seen by a large and diverse audience, and avoid showing the same ad too frequently to the same people, which can lead to ad fatigue and lower engagement.

Reach can also be used to compare the performance of different ad campaigns, ad sets, and ads, and to identify the most effective targeting and creative strategies. By analyzing reach data, advertisers can optimize their ad campaigns for better results and improve their return on investment.