Quantitative Structure-Activity Relationship (QSAR) is a computational method used in chemistry and biology to predict the activity of chemical compounds based on their molecular structure. By analyzing the relationship between chemical structure and biological activity, researchers can identify which molecular features contribute to a compound's effectiveness, helping in drug design and development. QSAR models utilize statistical techniques to correlate chemical properties with biological effects. These models can guide scientists in selecting promising candidates for further testing, reducing the time and cost associated with experimental trials. This approach is particularly valuable in fields like pharmaceutical research and toxicology.