Bronchiectasis, a chronic respiratory condition marked by abnormal bronchial dilation and impaired mucus clearance, can be classified into tubular, saccular, and cystic types. The condition is characterized by recurring cough with purulent sputum and can arise from primary congenital causes or as a secondary complication of other diseases. Diagnosis involves imaging techniques like CT scans and bronchoscopy, while treatment may include antibiotics, drainage techniques, and in some cases, surgical intervention.