CRD, also known as Chronic Respiratory Disease, is a prevalent respiratory condition that can affect both humans and animals. Some common synonyms for CRD include chronic obstructive pulmonary disease (COPD), bronchitis, emphysema, and asthma. COPD is typically associated with long-term exposure to smoking and other environmental pollutants. Bronchitis refers to a condition where the bronchial tubes in the lungs become inflamed, leading to coughing and difficulty breathing. Emphysema results from damage to the small air sacs in the lungs, impairing the oxygen exchange process. Lastly, asthma is a chronic respiratory condition characterized by coughing, wheezing, and chest tightness, often triggered by environmental factors such as pollution or allergens.