👉 Multi-variable calculus, or MvM, is an extension of single-variable calculus that deals with functions of multiple variables, typically explored through partial derivatives and multivariable integrals. Partial derivatives measure the rate of change of a function with respect to one variable while keeping others constant, providing insight into how changes in one input affect the output. Multivariable integrals generalize the concept of integration to functions of several variables, allowing for the calculation of volumes, surface areas, and other quantities over regions in higher-dimensional spaces. These tools are crucial for understanding complex systems in fields like physics, engineering, and economics, where phenomena often depend on multiple interacting variables.