If your system was built before 2010, then even though it might run the latest OS X versions, it will not have Internet Recovery as an option, which can result in problems if you have swapped out the hard drive, or experience problems with it and wish to reinstall freshly. This mode is convenient to have, since errors with the hard drive or a blank hard drive could prevent the conventional recovery partition from working. New Mac systems built in 2010 and later support an Internet Recovery mode, which can be used to download the boot image generally stored on the OS X Recovery partition so you can run diagnostics.
After purchasing a new hard drive or managing a corrupt one on an older Mac, you can install your current version of OS X even though you might not have a working Recovery option (on the drive or through Internet Recovery) present on your system.
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