What is pedagogical content knowledge (PCK)?

It is an understanding of how to represent topics in ways that makes the concept understandable to learners, as well as an understanding of what makes specific topics easy or difficult to learn (Darling-Hammond & Bransford, 2005; Kunter et al., 2013; Shulman,1986). It also includes the teachers' abilities to identify students' most common misconceptions and to help students resolve their misunderstandings (Sadler, Sonnert, Coyle, Smith, & Miller, 2013).