Integral Calculus is a branch of mathematics that focuses on the concept of integration, which is the process of finding the integral of a function. It is used to calculate areas under curves, volumes of solids of revolution, and other quantities that can be represented as the accumulation of infinitesimal changes. The fundamental theorem of calculus links differentiation and integration, showing that they are essentially inverse processes. In practical applications, Integral Calculus is essential in fields such as physics, engineering, and economics. It helps in solving problems related to motion, area, and growth, making it a powerful tool for understanding and modeling real-world phenomena.