Mac OS X 10.7 (Lion) was created by a team of programmers at Apple.
Mac "Lion" and Mac "Snow Leopard" refer to iterations of Apple's Mac OS X (operating system, version 10). "Lion" is the newest as of this writing, and is version 10.7, while "Snow Leopard" is its immediate predecessor, and is version 10.6.
Mac OS X 10.7 (Lion) will be available in the summer 2011 (See links below).
Mac OS X Lion will be release some time in July of 2011. UPDATE: Mac OS X Lion will be released ONLY on the Mac App Store no DVD's on July 14th, 2011
Eat your mac
The latest is Mac OSx 10.8.3 Mountain Lion as of 3/18,2013.
Mac OS X Lion is version 10.7
If the computer is running Mac OS Lion or higher we recommend the 2011 version.
Lion Vs. Lion was created in 1981.
Mac OS 10.6
NO
iPhone apps work on iOS devices (iPhone, iPad or iPod Touch) they will not work on a Mac running Mac OS X 10.7 (Lion) or any other Mac OS X version
According to the Apple website, Mac OSX Mountain Lion can be purchased for $19.99 if you are already running Lion or Snow Leopard. You can purchase directly through the Mac Apple Store icon on your computer.