In more detail
Engagement includes likes, comments, shares, saves, and clicks. Engagement rate puts that number in context by dividing it by reach or follower count, so a small account and a big one can be compared fairly. It tells you whether your content actually resonates, not just how many people it reached.
Example
If a post reaches 1,000 people and 80 of them like, comment, or share it, the engagement rate is 8 percent. On most platforms, anything above a few percent is healthy.
FAQ