Java Thread.sleep() is a static method that causes the current thread to pause its execution for a specified number of milliseconds. It is commonly used in scenarios where a thread needs to wait or be delayed, such as in time-based operations or simulations. Introduced in Java 1995 with Java 1.0, sleep() is essential in multithreading environments for controlling timing, ensuring periodic execution, or introducing delays between operations.

https://docs.oracle.com/javase/8/docs/api/java/lang/Thread.html