Big data refers to the large and complex sets of data that are difficult to manage and process using traditional data processing tools. These datas typically come from various sources, such as performance analisys, sensors, and transaction records, and can be analyzed to reveal patterns, trends, and insights that can inform decision-making and help solve complex problems. In training activities , big data can be used to analyze learner performance and engagement, identify learning gaps, and improve training methods. It can also be used to monitor and evaluate the effectiveness of educational programs and policies.