Oracle Java for Mac or Java 7 JRE/Java SE Runtime Environment 7 is the official version of Java for Mac by Oracle that allows you to run Java applications and games, both in your web browser and within the OS X Desktop. Because of security concerns, its only recommended that you install Java for Mac if you really need it.
Up until now, Apple has its own version of Java, which is out of step with the Windows and Linux versions. With Java 7 JRE you have the latest official version, along with Windows and Linux, and with the functionality promised by Oracle, the owners of Java. Since Java is frequently subject to security exploits, and Oracle issue fixes before Apple, its a good idea to always have this version of Java installed rather than Apple's.
Java 7 JRE is easy to install and from System Preferences, you have many settings to customize it with although the default setting works correctly. From the settings you can also check for updates and decide how much space to devote to Java on your hard drive.
If you regularly use Java applications or games, Oracle Java for Mac is always the most up to date version of Java available.
- Contains fixes for security vulnerabilities