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Integration is the area under a smooth curve in calculus, which could be applied in the real world. The area under the curve could be divided into lots of rectangles that are parallel to the y-axis. Then, pulsing the rectangles, which is the area of the curve.

Even though the method of integration is widely applied in the field of Physics, Engineering, and Astronomy, the idea of integration was first invented by ancient Greek scientist Eudoxus. Surprisingly, in the far east, the idea of integration also emerged in China, which was proposed by Zu Chongzhi. He used integration to calculate the total area of circles, which is very like the modern integration method.  However, most of these theories are not vigorous, which cannot be applied in the daily life. After hundreds of years, Isaac Newton, another famous mathematician in England, published his book The Principia, which better explains and perfects the idea of integration. This book had profound impact in that era. Breakthrough in fields of navigation, astronomy and mechanical system were made by other scientists using the Newton’s new idea of integration. Until now, integration is still an important part of the subject of Calculus.

Integration can apply in other areas. For example, in physics, integration is used to calculus the relationship between displacement, velocity and acceleration. When students are given the velocity of an object, displacement can be calculus by using integration. And velocity also can be calculus by using it when acceleration is given. Because acceleration is the derivative of velocity and velocity is the derivative of displacement. And in mathematics, derivative is related to integration. Integration also can be used in the life. A computer, it consumes electricity when it is opening, but it is difficult to calculus the average electricity consumption of it. Then integration can be used. After getting the graph of electricity consumption each time, the total electricity consumption can be calculus by using the knowledge of integration. Next average consumption can be known. That helps computer company design better computers which use less electricity. There are extra applications of integration in other subject and in the life. Integration is helpful for science and life applications.