Since its emergence, restorative justice (RJ) has attracted scholars, practitioners and policy-makers from around the world. At the same time, however, such popularity has also generated confusion and a lack of consensus on what is RJ. Different people have proposed different notions of what qualifies as RJ. This article aims to contribute to such an ongoing debate by providing an overall picture of RJ. In this commentary, consideration is given to three aspects of RJ: concept, definition and practice.