Final answer:
Acute laryngotracheobronchitis, characterized by a distinctive barking cough and difficulty breathing, is commonly known as croup.
Step-by-step explanation:
Acute laryngotracheobronchitis is also known as croup. It is an inflammatory condition that affects children's airways, primarily the larynx, trachea, and bronchi. Croup leads to a distinctive barking cough and may cause difficulty breathing and a hoarse voice, often sounding like a seal's bark. The inflammation is commonly caused by viruses, and the condition typically resolves with supportive care, although severe cases may require medical intervention.