Acute respiratory infection (ARI) affects normal breathing and can involve the upper or lower respiratory systems, caused by various viruses such as rhinovirus and influenza. Symptoms include cough, congestion, and fatigue, and transmission occurs through airborne droplets; effective management includes early detection, treatment, and preventive measures like breastfeeding and vaccination. Immunization against diseases like measles and pneumonia is crucial in controlling ARI, along with recommendations for clinical assessment and addressing malnutrition in affected individuals.