Engagement rate shows how much people interact with your content instead of just scrolling past it. It's usually measured by adding up likes, comments, shares, or clicks, then dividing by the number of followers or views. For example, if 100 people saw your post and 10 reacted, your engagement rate is 10%. It's not about how many followers you have but how active they are with what you post. A smaller page with loyal followers can have a higher engagement rate than a big one with silent followers. It helps you see if your content actually connects with people or if it needs improvement. Watching it over time can also show what kind of posts people enjoy the most.