Nitrox is a breathing gas mixture that contains nitrogen and oxygen, commonly used in recreational diving. It typically has a higher percentage of oxygen than regular air, which allows divers to extend their bottom time and reduce the risk of decompression sickness. Divers using Nitrox must be trained to understand its benefits and limitations, as higher oxygen levels can lead to toxicity at greater depths. Special equipment and procedures are often required to ensure safe diving practices when using this gas mixture.