Photocatalysis has shown tremendous potential to solve world problems with environmental pollution and energy scarcity. In this list, ternary metal chalcogenides ZnIn₂S₄ (ZIS) has garnered attention over others due to its superior visible light capability, low-cost, excellent chemical stability, and substantial interdisciplinary interest. Recent investigations have shown the development of a wide range of ZIS nanocomposite structures. Several modulated strategies are involved in enhancing the activity of ZIS-based nanocomposites. In this review, various synthesis strategies of ZIS are added. Furthermore, we observed the advantage of the ZIS electronic structure for water splitting along with pollutants removal, organic synthesis, sensing, nitrogen fixation, and many more. Modification leads to enhanced material effectiveness for hydrogen production. This review hopes to inspire further research into this promising material for application in efficient energy and environment by showcasing the state-of-the-art of ZIS photocatalysts. In this context, we discussed the mechanism behind hydrogen production.