A nebulizer is a medical device that converts liquid medication into a fine mist, making it easier to inhale into the lungs. It is commonly used to treat respiratory conditions such as asthma, chronic obstructive pulmonary disease (COPD), and other lung diseases. The device typically consists of a compressor, a medication cup, and a mouthpiece or mask. Patients use nebulizers by placing prescribed medication in the cup, turning on the device, and breathing in the mist. This method allows for direct delivery of medication to the airways, providing quick relief from symptoms like wheezing and shortness of breath.