The new Long Term Support JDK version, JDK 21, was released on September 19th as a general availability (GA) release, marking a two-year cycle since the previous LTS version, JDK 17. This new version offers several key features and improvements, including code snippets in Java API documentation, sequenced collections with consistent methods across collections, record patterns for testing instance of record classes, pattern matching for switch statements to reduce boilerplate code, virtual threads for improving concurrency and performance, and disallowing dynamic loading of agents to improve security. By using JDK 21 LTS, developers can ensure stable, secure, and efficient software by locking in support for the next eight years.