Watch this neat video explaining how ARM's big.LITTLE works in a way everyone can understand5
But what exactly is big.LITTLE and how does it work?
The basic ideas is that it allows users to have big processing cores that do the heavy lifting when your device has to handle a challenging task, while LITTLE cores are used for less intense workloads, and when your phone is not doing much, both cores can go into sleep when they do not consume energy.
Of course, this is barely touching the surface and won't grant you a deep understanding of the platform, but it's a good place to start to understand and get excited about the technology that makes possible the increased performance of modern mobile gadgets. Explained by the folks over at ARM with a human touch, the video below is just that, take a look.