Java 2 Standard Edition (J2SE) is a version of the Java programming language that provides a platform for developing and running applications on desktop and server environments. It includes essential libraries, tools, and APIs that enable developers to create robust software. J2SE introduced features like the Swing graphical user interface toolkit and the Java 2D API for advanced graphics. Released in 1998, J2SE was a significant update to the original Java platform, enhancing performance and usability. It laid the groundwork for subsequent versions, such as Java SE, which continues to evolve with new features and improvements for modern application development.