This is a question many students ask their teachers from the beginning of time; however, I feel like a solid answer has never been offered. We learn all these rules, concepts, and tests, but we have no idea of how they relate to the real world. I think if we could -not just answer, but demonstrate to students the power of math, then their interest in the STEM field would increase tenfold! For example: Why do we learn how to count, add, subtract, multiply and divide? It's the first thing we learn! The answer is, (one of many) we use those fundamental tools in the real world to keep track of money, as well as objects. For example, let's assume there are an assortment of chairs in an auditorium. We will also assume the chairs are arranged in a rectangular shape. Your boss tells you to count those chairs and make sure there are at least 100. However, because you know geometry and you know that the width and length of a rectangle equals its area, you also know that there are 100 chairs in the auditorium only if the width and length of the arranged chairs are factors of 100; like 5 and 20, or 4 and 25 respectively. I recently finished taking Calculus II during the Summer. I earned an A, however, that grade represents my ability to solve problems in a mathematics course, not apply it to the real world. I learned new tools and techniques, including the various tests used to determine whether a series converges or diverges. In spite of it all, I have no idea how I am going to apply these techniques when I get a job. When is it relevant? I would like for everyone to post below about any concepts or techniques you learned and somehow relate it to something in the real world.