The Message Passing Interface (MPI) is a standardized and portable communication protocol used in parallel computing. It allows multiple processes to communicate with one another, enabling them to work together on complex tasks. MPI is widely used in high-performance computing environments, where tasks are distributed across multiple processors or computers. MPI provides a set of functions that facilitate the exchange of messages between processes, ensuring efficient data transfer and synchronization. It supports various communication methods, including point-to-point and collective communication, making it versatile for different applications. Many scientific and engineering applications rely on MPI to achieve faster computation times and improved performance.