A Breathalyzer is a device used to measure the amount of alcohol in a person's breath. It works by analyzing the air exhaled from the lungs, which contains alcohol if the person has been drinking. Law enforcement often uses Breathalyzers during traffic stops to check if drivers are over the legal limit for alcohol consumption. These devices are important for promoting road safety and preventing accidents caused by drunk driving. Many people also use personal Breathalyzers to monitor their own alcohol levels before deciding to drive. Overall, Breathalyzers play a crucial role in reducing alcohol-related incidents on the roads.