Integration is a mathematical operation that is one of the two fundamental operations of calculus, the other being differentiation. It is the process of calculating the integral of a function, which is the continuous analog of a sum, and is used to calculate areas, volumes, and their generalizations. Integration can be used to find areas, volumes, central points, and many other useful things. It is a way of adding slices to find the whole. In calculus, differentiation is the process of finding the derivative of a function, while integration is the process of finding the antiderivative of a function. These processes are inverse of each other, and integration is also called anti-differentiation.

In addition to its mathematical meaning, integration can also refer to the action or process of successfully joining or mixing with a different group of people. It can also refer to IT integration, which is the connection of data, applications, APIs, and devices across an IT organization to be more efficient, productive, and agile.