Area under the curve (AUC) in mathematics and statistics is a popular term that refers to the total area bounded by a curve on a specific interval. It is used to measure several statistical measures, including probability, sensitivity, and specificity. In the context of machine learning and data science, AUC is often used to evaluate the performance of classification models. Synonyms for the term AUC include integral, enclosed area, closed area, enclosed region, and bounded area. These terms are often used interchangeably, and they all refer to the same fundamental concept of the area under the curve.