The article provides an overview of the field of sustainability transitions research, which emerged in the past two decades to address large-scale societal transformations toward sustainability. It describes the different scientific approaches and methodological positions that explore various types of transitions and contribute to theories and models for governance. The article distinguishes three perspectives—socio-technical, socio-institutional, and socio-ecological—and highlights common concepts such as path dependencies, regimes, niches, experiments, and governance. These concepts have been adopted within the analytical perspective of transitions, leading to three types of approaches dealing with agency in transitions: analytical, evaluative, and experimental. The field has produced a broad theoretical and empirical basis, along with social transformation strategies and instruments, impacting both disciplinary scientific fields and policy practices. The article aims to characterize the field by identifying its main perspectives, approaches, and shared concepts, as well as its relevance to real-world sustainability problems and solutions.The article provides an overview of the field of sustainability transitions research, which emerged in the past two decades to address large-scale societal transformations toward sustainability. It describes the different scientific approaches and methodological positions that explore various types of transitions and contribute to theories and models for governance. The article distinguishes three perspectives—socio-technical, socio-institutional, and socio-ecological—and highlights common concepts such as path dependencies, regimes, niches, experiments, and governance. These concepts have been adopted within the analytical perspective of transitions, leading to three types of approaches dealing with agency in transitions: analytical, evaluative, and experimental. The field has produced a broad theoretical and empirical basis, along with social transformation strategies and instruments, impacting both disciplinary scientific fields and policy practices. The article aims to characterize the field by identifying its main perspectives, approaches, and shared concepts, as well as its relevance to real-world sustainability problems and solutions.