The data displayed on these metrics will help you understand how many of your followers are likely to see your posts. Users are broken down into four categories of reachability:
-Easily accessible (these users always see your post)
-Semi-reachable (these users do not always see your posts)
-Hardly-reachable (these users rarely see your posts)
-Unreachable (these users almost never look at their feed or are very inactive)
You can also see the what percentage of your followers have private vs public accounts. Remember you can also analyze these metric on your competitor accounts!