iOS or iPhone Operating System is a software used by various devices of Apple Company in its products.
The Range includes: iPhones,iPads,iPods,Apple TV etc.
Current Running:- 12.3
Downgradable to Previous one? : No
Kernel Type:- hybrid
Jailbreak Status:- Only 9.1 jail breakable and not supported for 64-bit architecture.
Note that the Information provided here is latest to the time when this article was updated.