The Azul Commercial Compatibility Kit (ZCCK) is designed to ensure compatibility of Azul Zulu Builds of OpenJDK (Azul’s 100% open source, certified builds of OpenJDK) and Oracle’s proprietary Java SE ...

The Microsoft Build of OpenJDK is a new no-cost long-term supported distribution and Microsoft’s new way to collaborate and contribute to the Java ecosystem.

Developers should download the JDK package (Java Development Kit) and non-developers should get the JRE (Java Runtime Environment) package. You don't need both.

The next LTS release will be Java 21 in 2023. With JDK 17, Oracle will allow free use of Oracle JDK binaries in production for three years, one year past the next LTS.