What's that ?
The laptop manufacturers developed new technologies involving two graphic cards in an single computer, enabling both high performance and power saving usages. This technology is well supported on Windows but it's still quite experimental with Linux distributions.
We call hybrid graphics a set of two graphic cards with different abilities and power consumptions. It has nothing to see with other technologies like SLI or CrossFire, intended to improve only the computing power of a system without taking care of power consumption.