 Electrolyte wetability is a key factor in determining the performance of electrodes in various electrochemical systems. This review summarizes the current state of research into the effects of electrolyte wetability on the performance of electrodes in supercapacitors, metal ion batteries, metal-based batteries, fuel cells, and capacitive deionization systems. It also discusses the challenges associated with improving electrolyte wetability and the characterization techniques available for measuring it. This article was authored by Lei Xiao, Yuan Li, Mimi Yu, and others.