Tin(IV) sulfide (SnS₂), also known as stannic sulfide, is an inorganic compound with a layered hexagonal crystal structure similar to molybdenum disulfide (MoS₂). It appears as a golden-yellow crystalline solid or powder and is insoluble in water. This material is a semiconductor with a bandgap that can be tuned, making it of significant interest in modern materials science. The primary applications of SnS₂ are in the fields of optoelectronics and energy storage. In photovoltaics and photodetectors, it is investigated as a component in thin-film solar cells and as a two-dimensional (2D) semiconductor material due to its suitable bandgap and strong light absorption. In lithium-ion and sodium-ion batteries, SnS₂ is studied as a promising anode material because of its high theoretical capacity stemming from alloying and conversion reactions. Its layered structure facilitates ion intercalation. Beyond these, SnS₂ also finds use as a solid lubricant due to its layered structure and in catalysis. It is generally considered stable under ambient conditions but may decompose upon strong heating, releasing sulfur oxides.