Lung development is the process by which the lungs form and mature in the fetus, continuing through childhood and into early adulthood. This complex process involves the branching and growth of the respiratory system, the differentiation of various cell types, and the formation of functional structures necessary for breathing and gas exchange. Abnormal lung development can lead to respiratory disorders and diseases such as asthma, chronic obstructive pulmonary disease (COPD), and lung cancer. Researchers study lung development to better understand the underlying mechanisms and potential therapeutic interventions for these conditions.