Hydrogen sulfide, often referred to as hydrogen sulfate, is a chemical compound with the formula H₂S. It is a colorless gas known for its distinct smell, reminiscent of rotten eggs. This compound is produced naturally in various environments, including volcanic eruptions and the decay of organic matter. In industrial settings, hydrogen sulfide is used in the production of sulfuric acid and in petroleum refining. While it has some applications, it is also highly toxic and can be dangerous in high concentrations, posing health risks to humans and animals. Proper safety measures are essential when handling this compound.