Mountain Lion is the latest version of OSX released by Apple few days back. The new OS comes with lots of new features and overall improvements. In Mountain Lion, Software Update is handled through the Mac App Store. If you are using Mountain Lion, you can set the OS to install all future updates automatically without having to manually update.
If you want to install updates automatically on your Mac Mountain Lion, go into System Preferences > Software Update you can choose to download automatically system data files and security updates.
You can even download automatically purchases made from other Macs, like in iOS, so that you won’t think about them anymore.
Stay tuned for more tips on Mountain Lion.