Your followers in Pinterest can engage with you in a number of ways including repinning, liking, and commenting on your Pins. When they repin your Pin, your reach grows.
This insight shows a trending line graph of the overall number of repins, likes, and comments for your Pinterest account . It also allows you to see how these engagement KPIs are trending over time.
If you notice a spike in your engagement metrics, look at the Best Performing Pins insight and Engagement Rate by Boards insight to see which pins and boards are engaging well with your followers. It's likely your followers want to see similar content from you. These metrics are a good indicators to help you keep your audience engaged and grow.