Once upon a time, jailbreak was a common way to break away from Apple's restrictions and be able to do whatever you want with your Iphone. Apple itself shielded it like the plague and for many years a silent war between company engineers took place, which did its best to fix all security holes and the community that utilized the weaknesses of iOS to install their own software.
In recent years the phenomenon has more or less died out. IOS has become more difficult to crack and the features that many users searched for by jailbreak, Apple has chosen to implement directly in the operating system.
But if you still feel locked up in IOS and own an Iphone X, here's a good news – The first sign of jailbreak to Apple's new flagship is here, writes 9to5Mac.