For those not so familiar with the lingo, a patent basically gives an inventor exclusive rights to their invention. It prevents others from using your invention in their products. Patents are usually filed with the U.S. Patent and Trademark Office long before an idea makes its way onto the shelf.
The reason why Apple patents are so popular is that everyone from Wall Street to gadget blogs wants to know what Apple's next innovation is going to be. Although a lot of patents never reach consumer products, it still gives us a glimpse of what Apple is working on...