A Venturi mask is a medical device used to deliver a precise concentration of oxygen to patients who require respiratory support. It consists of a face mask connected to a series of color-coded adapters that control the flow of oxygen. Each adapter allows for different oxygen concentrations, making it suitable for patients with varying needs. This mask is particularly useful in emergency situations or for patients with chronic respiratory conditions, as it ensures that they receive the right amount of oxygen without the risk of over-oxygenation. The design of the Venturi mask helps maintain stable oxygen levels, which is crucial for effective treatment.