Oracle JDK is the Java Platform, Standard Edition (SE), that Oracle maintains. However, updates are only available if you have a commercial license. OpenJDK is a free and open source implementation of Java SE.
Why Should You Move to OpenJDK?
Read this datasheet to learn about the differences between Oracle JDK and OpenJDK, including cost comparisons and the comprehensive enterprise support that you can get for OpenJDK from OpenLogic.