Oracle JDK
Oracle JDK (Java Development Kit) is a proprietary implementation of the Java Platform, Standard Edition (Java SE) provided by Oracle Corporation. It includes the Java Runtime Environment (JRE), compilers, debuggers, and other tools necessary for developing, testing, and running Java applications. It is widely used in enterprise environments for building server-side applications, desktop software, and Android apps (historically).
Developers should learn Oracle JDK when working on enterprise Java projects that require long-term support (LTS), commercial features like Java Flight Recorder, or specific Oracle integrations. It is essential for applications that rely on Oracle's certified Java SE compatibility, such as legacy systems or environments with strict licensing requirements. However, for most modern development, open-source alternatives like OpenJDK are recommended due to licensing and cost considerations.