Respiratory devices are indispensable tools that help manage a wide range of respiratory conditions, allowing individuals to breathe more comfortably and effectively. From sleep apnea to chronic obstructive pulmonary disease (COPD) and asthma, these devices play a crucial role in improving patients' quality of life. In this article, we will look at four key respiratory devices: Continuous Positive Airway Pressure (CPAP) machines, mechanical ventilators, nebulizers, and oxygen concentrators, and explore how these devices work, their special features, and emerging applications.