A Breathalyzer is a device used to measure the alcohol content in a person's breath. It works by analyzing the amount of alcohol vapor present when a person exhales. This information is then converted into a blood alcohol concentration (BAC) reading, which helps determine if someone is over the legal limit for driving. Breathalyzers are commonly used by law enforcement officers during traffic stops to assess whether drivers are impaired. They can also be found in some workplaces and rehabilitation programs to monitor individuals for alcohol consumption. These devices play a crucial role in promoting safety and responsible behavior.