Imagine you are playing a game of tag with your friends. After you play the game, you might want to know who was "it" the most, or who got tagged the least. This is kind of like how "post track" works.
When people post things on social media, like Instagram or Twitter, post track helps keep track of how many people are interacting with the post. It counts how many likes, shares, and comments a post gets. It can also show you which country the likes are coming from or what kind of device people are using to view the post.
Just like with the game of tag, post track helps you understand who is "it" or who is popular on social media. Businesses and influencers use post track to see which posts get the most attention and which ones they should post more often.