Apple's much-anticipated Mac OS X Lion has been finally released, and it will power Apple's new line of MacBook Air notebooks.

OS X Lion was unveiled during the Apple Worldwide Developers Conference (WWDC) 2011 in June -- and Apple fans who didn't mind the wait are being rewarded. The operating system represents a leap forward in terms of OS advancement.

What is all the hype about surrounding Mac's OS X Lion? The answer lies in what updated and new features the latests OS offers.

Current MacBooks are powered by Mac OS X 10.6 (Snow Leopard), which was released in June 2009. And in line with the usual two years between OS upgrades, Mac released 10.7 this week. OS X Lion includes a number of features that will make Apple's ultraportable MacBook Airs more appealing for on-the-go users.

People have been doing the same things on computers for years. Clicking, scrolling, installing, saving. With OS X Lion, we’ve challenged the accepted way of doing things by introducing new features that change the way you use a computer, Apple states on its Web site.

According to AppleInsider, OS X Lion is the latest and greatest Mac OS ever launched.

We agree. Lion sports more than 250 new features and 3,000 new developer APIs. Here are the top 15 reasons why we think OS X Lion could be the best Mac OS released so far. Click on the slideshow to begin.