An inhaler is a medical device used to deliver medication in the form of a mist inhaled into the lungs. It is commonly used for the treatment of asthma and other respiratory conditions. The inhaler typically consists of a small, handheld plastic or metal canister that contains the medication, which is released through a mouthpiece when the user presses down on the canister. Some inhalers also come with a spacer, which helps to ensure that the medication is delivered effectively into the lungs. Inhalers are portable, easy to use, and provide quick relief for respiratory symptoms.