Engagement Rate is a social media metric that tells you much a post is motivating people to interact with it. It’s defined as (number of people who engaged with your post / number of people who saw your post) x 100%.
Typically, a higher engagement rate means your post was more compelling (or at least more likely to provoke a response).
Engagement rate is difficult to compare across social networks, as what counts as an “engagement” and what counts as “seeing your post” is different on each network. “Seeing your post” could refer to reach or impressions, while “engagements” may include likes, comments, shares, reactions, and more.