The audience is who the paper is tailored towards. They are the ones who are doing to read, react and even share your work. Your audience may differ depending on the things you write about. It attracts different types of individuals to interact with your work. There may be many people but you have to specify who your audience is.
At the beginning of the year, I didn’t quite get the concept of it being super specific but over time through our assignments, I have a better understanding of my audience. You should always beware of who they are so you know what you are writing about since they are the ones who are going to read it.