An Executor Service is a framework in the Java programming language that simplifies the management of asynchronous tasks. It allows developers to run tasks in the background without manually handling threads, making it easier to manage concurrent execution. The service provides methods to submit tasks and control their execution, improving application performance and responsiveness. The Executor Service can manage a pool of threads, allowing multiple tasks to run simultaneously. It supports various task types, including Runnable and Callable, enabling developers to choose the best approach for their needs. This framework is part of the java.util.concurrent package, which enhances multi-threading capabilities in Java applications.