 On-skin electrodes have been developed over the last decade to provide a comfortable and reliable platform for electrophysiology studies. These devices offer many advantages including stretchability, biocompatibility, and wearable comfort. Recent developments have focused on improving the performance of these devices through material selection, integration of sensors, and strategies to increase adhesion and breathability. Integrated systems have also been developed which combine multiple sensors into one device. This review provides an overview of the current state of research and development in on-skin electrodes and their integrated systems. This article was authored by Hao Wu, Guangguang Yang, Kanhao Zhu, and others.