A meta-analysis is a statistical technique that combines the results of multiple studies to identify overall trends and effects. By aggregating data from various research projects, it provides a more comprehensive understanding of a specific topic, often leading to stronger conclusions than individual studies alone. Researchers conduct meta-analyses to evaluate the effectiveness of treatments, interventions, or other variables across different populations and settings. This method helps to resolve conflicting findings in the literature and can guide evidence-based practices in fields such as medicine, psychology, and education.