The ForkJoinPool is a specialized implementation of the ExecutorService in Java, designed to efficiently handle tasks that can be broken down into smaller subtasks. It uses a work-stealing algorithm, allowing idle threads to "steal" tasks from busy threads, which helps optimize resource usage and improve performance in parallel processing. This pool is particularly useful for tasks that follow the divide-and-conquer strategy, where a large problem is recursively divided into smaller problems. The ForkJoinPool is part of the java.util.concurrent package and is commonly used in applications that require high levels of concurrency and parallelism.