Java CountDownLatch.await() is a method in the Java CountDownLatch class that blocks the calling thread until the latch's countdown reaches zero. It is typically used to synchronize multiple threads, ensuring that one or more threads wait for other threads to complete their tasks before proceeding. Introduced in Java 2004 with Java 5, the await() method is essential for coordinating multi-threaded tasks and is often used in parallel processing scenarios.

https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CountDownLatch.html