The Oracle (formerly Sun) Java Platform, Standard Edition (Java SE or JSE) allows you to develop and deploy Java applications on desktops and servers as well embedded and real-time environments. The Java Development Kit (JDK) contains the essential compiler, tools, runtime libraries, and APIs for developers writing, deploying, and running applets and applications in the Java programming language. The Java Runtime Environment (JRE) contains the runtime libraries and tools for running applets and applications.

Changes:
Many serious security vulnerabilities, many of them affecting the browser plug-in, were fixed. Further fixes and enhancements were made.

URL:
Oracle Java Platform, Standard Edition – Freecode