Bronchiectasis is a chronic lung condition defined by the permanent dilation of the bronchi. It has both congenital and acquired causes such as infections from tuberculosis, pneumonia, or cystic fibrosis. Symptoms include chronic cough, production of large amounts of purulent sputum, and recurrent lung infections. Diagnosis involves imaging like CT scans and pulmonary function tests. Treatment focuses on airway clearance techniques, antibiotics for infections, and surgery in severe cases. Nursing care aims to improve lung function and prevent infections through techniques like postural drainage and breathing exercises.