Structural realism is a hot topic in the debate between scientific realism and anti-realism. To understand it, we first need to know about scientific realism. Scientific realism argues that the best explanation for scientific success is that our theories accurately describe the world. There are four forms of scientific realism, including structural realism. Structural realism looks at the structure of theories rather than specific entities. It is divided into epistemic, ontic, and entitative forms, with the entitative form being preferred because it avoids being one-sided and incomplete.