Breath sounds are the noises produced during breathing, which can be heard using a stethoscope. These sounds help healthcare professionals assess lung function and identify potential respiratory issues. Common types of breath sounds include vesicular, bronchial, and adventitious sounds, each indicating different conditions. Normal breath sounds are typically soft and rustling, while abnormal sounds, such as wheezing or crackles, may suggest problems like asthma or pneumonia. Listening to breath sounds is an essential part of a physical examination, providing valuable information about a patient's respiratory health.