Volatile sulfur compounds (VSCs) are a class of organic and inorganic chemicals containing sulfur that easily evaporate at room temperature, contributing to odors in foods, spices, and natural environments. Hydrogen sulfide (H2S), a representative VSC, is a colorless gas with a characteristic rotten egg smell, produced by bacterial action in decaying matter, volcanic gases, and during food processing like in garlic or onions. In spices and foods, VSCs such as H2S, dimethyl sulfide, and allyl methyl sulfide enhance flavors and aromas, providing pungent, savory notes in items like mustard, wasabi, and fermented products. Chemically, H2S is a weak acid that dissociates in water to form hydrosulfuric acid, reacting with metals to form sulfides and playing roles in biological signaling as a gasotransmitter. Its physical properties include low boiling and melting points, making it highly volatile. In food science, VSCs are studied for their impact on sensory perception and shelf-life, but they can also indicate spoilage. Research from peer-reviewed sources like the Journal of Agricultural and Food Chemistry highlights their formation via enzymatic pathways in plants and microbes. Overall, VSCs are crucial for flavor chemistry but require careful handling due to toxicity risks.