Java ExecutorService is an interface in Java's java.util.concurrent package that provides a higher-level replacement for the Java Thread class. It allows for managing and controlling thread execution in a more flexible way by abstracting away the creation and management of individual threads. Introduced in Java 2004 with Java 5, ExecutorService simplifies multi-threading tasks and is commonly used for managing large numbers of asynchronous tasks or long-running operations in Java applications.

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