In more detail
Followers are the audience that opted in to hear from you, so follower count is the simplest measure of how big that audience is. It is a useful baseline, but on its own it can mislead. Followers can go inactive, unfollow, or be fake, and a large count means little if almost no one engages. That is why follower growth over time and the share of followers who actually interact tell you more than the raw total.
Example
If you start the month with 2,000 followers and end with 2,150, you gained 150 net followers, a 7.5 percent monthly growth rate. If only 40 of them like or comment on a typical post, your audience is bigger on paper than it is in practice.
FAQ