ForkJoinTask is a part of the Fork/Join Framework in Java, designed to efficiently handle parallel processing of tasks. It allows developers to break down complex tasks into smaller, manageable subtasks that can be executed concurrently. This framework is particularly useful for tasks that can be divided into independent parts, enabling better resource utilization and faster execution. The ForkJoinPool manages the execution of ForkJoinTask instances, using a work-stealing algorithm to balance the workload among available threads. When a task is split, the main task can continue processing while the subtasks are executed in parallel, improving performance in multi-core environments.