Hybrid drives combine both Solid State Drives and Hard Disk Drives. Since SSDs cost more per gigabyte, it's expensive to buy an SSD big enough to hold everything. So the idea behind hybrid drives is that it would combine the speed benefit of SSD with the capacity benefits of the traditional, spinning drive. It puts both drives in one enclosure and uses smart software to determine what data should go on the SSD and what should go on the hard drive.
Leo thinks that hybrid drives are better than spinning drives, but they aren't better than a full SSD. For something like a Playstation 4 gaming console, however, it's probably a good choice. It will analyze how the PS4 is using data and allocate it appropriately.