The `java.util.concurrent` package is a part of the Java programming language that provides tools for managing concurrent programming. It includes classes and interfaces that help developers create multi-threaded applications, allowing multiple tasks to run simultaneously. This package simplifies thread management and improves performance by providing high-level abstractions like thread pools, locks, and concurrent collections. Key components of `java.util.concurrent` include the Executor framework, which manages thread execution, and CountDownLatch, which allows one or more threads to wait until a set of operations completes. These tools help developers write efficient and safe concurrent code, reducing the complexity of handling threads directly.