Instagram audience reach is shown in the expanded information beneath each post, provided a business account is active. It means the number of profiles that have seen the post in some form: in their activity feed, in recommendations or directly on the profile. A post can also gain additional reach by appearing in top hashtag or location results; both routes can attract the target audience and potential customers.
How reach differs from the number of likes
Please note that when boosting likes through an API, the post’s reach does not increase, which may arouse suspicion in Instagram’s security system. This is why we always recommend like/view-boosting services that include additional audience reach — the only way to achieve real results when promoting an Instagram profile.
Our company developed an audience-reach boosting service that increases the probability of posts reaching the top results. You can order it at this link.
For a deeper understanding of the new algorithms for the operation of Instagram filters, we recommend reading the article Getting posts into top hashtag and location results.