This is a quick video explaining the characteristics of memory (RAM) that will function properly with your Mac (MacBook Pro, iMac, Mac Mini etc.). Many manufacturers sell "Mac Memory", that being said there are plenty of cheaper alternatives if you know what to look for. For the record Apple does not manufacture RAM - Most Apple computers ship with Samsung memory. Here is more information on the RAM that I purchased for my Early 2011 MacBook Pro -
Macbook users demand the highest performance from their systems, especially when working with digital media applications. Corsair's Mac Memory is specifically designed for rock-solid stability in demanding digital media rich environments. Corsair Mac Memory allows users to maximize memory capacity and throughput to increase their systems performance.