JDK 11 is a long-term support (LTS) release, which means it will be supported with updates and bug fixes for an extended period, typically for several years.

Some of the key features and improvements introduced in JDK 11 include:

1. Local-Variable Syntax for Lambda Parameters: This feature allows the ‘var’ keyword to be used as the parameter in lambda expressions, making the code more concise and readable.
2. HTTP Client (Standard): A new HTTP client library has been introduced in JDK 11 to provide better support for HTTP/2 and WebSocket protocols.
3. Epsilon Garbage Collector: JDK 11 introduced a no-op garbage collector called Epsilon, which is useful for scenarios where you want to test the performance of the application without incurring any garbage collection overhead.
4. Flight Recorder: JDK Flight Recorder (JFR), previously a commercial feature, is now available in JDK 11 as a part of OpenJDK. JFR allows you to collect low-overhead runtime information from a Java application.
5. Launch Single-File Source-Code Programs: JDK 11 allows you to run a single-file Java source code program directly using the ‘java’ command without explicitly compiling it.
6. Improved Docker Support: JDK 11 comes with enhancements to better support running Java applications in Docker containers.
7. ZGC (Experimental): The Z Garbage Collector (ZGC) was introduced as an experimental feature in JDK 11. It aims to provide low-latency and scalable garbage collection for large heaps.

It’s worth noting that JDK 11 is a significant release as it marks the end of public updates and support for some older technologies, including JavaFX, Java EE (Enterprise Edition), and CORBA (Common Object Request Broker Architecture).