Java 8 and Java 11 are two versions of the Java programming language and runtime environment. Java 8 was released in March 2014, while Java 11 was released in September 2018. Here are some of the main differences between these two versions:

1. Language features: Java 8 added several new language features, such as lambda expressions, method references, and the Stream API. Java 11 did not add any major new language features, but it did remove some old and deprecated ones, such as the Applet class and the JavaFX module.

2. Standard library: Java 8 included several new classes and packages in the standard library, such as the java.time package for working with dates and times, and the java.util.stream package for working with streams of data. Java 11 introduced a few new classes and packages, such as the java.net.http package for working with HTTP clients and servers, but it did not add as many new features as Java 8.

3. Long-term support: Java 8 is a long-term support (LTS) version, which means that it will receive security updates and bug fixes for a longer period of time than non-LTS versions. Java 11, on the other hand, is a non-LTS version, which means that it will only receive updates and fixes for a limited period of time before being replaced by the next version.

4. Release cadence: Java 8 was the first version of Java to follow a new release cadence, with a new version being released every 6 months. Java 11 is the second version released under this new cadence. This means that there are more frequent updates and new features being released, but the updates are generally smaller and less disruptive than in the past.

Overall, Java 8 is a more feature-rich version of Java, with a longer support period and a slower release cadence. Java 11 is a more up-to-date version with a shorter support period and a faster release cadence. Which version you choose will depend on your needs and preferences.