Stack Interchange is a method used in computer programming and data processing to manage the flow of information between different data structures, particularly stacks. A stack is a collection of elements that follows the Last In, First Out (LIFO) principle, meaning the last item added is the first one to be removed. Stack interchange allows for the transfer of data between multiple stacks, facilitating more complex operations and improving efficiency in algorithms. This technique is often utilized in programming languages and systems that require dynamic memory management. By enabling the interchange of data between stacks, developers can optimize resource usage and enhance the performance of applications, especially in scenarios involving recursive functions or backtracking algorithms.