The purpose of this theoretical study is to explore the relationships between the concepts of using mathematics in the daily life, mathematical applications, mathematical modelling, and mathematical literacy. As these concepts are generally taken as independent concepts in the related literature, they are confused with each other and it becomes difficult to understand the relationships between them. This study elaborates on the mathematical processes contained in these concepts and the mathematical skills required by these processes. An attempt is made to reveal the common ideas within these concepts, the points they emphasize, and the basic skills and acquisitions expected to be introduced to individuals. In this regard, sample application and modelling problems are presented. At the end of the study, some recommendations are put forward based on the results obtained in the study and the ideas suggested in the related literature.