I remember back in the day when people would “Jailbreak” iPhones, but never really picked up on what they were doing other than that it let them do stuff that those of us with “non-jailbroken” iPhones couldn’t do.
Are they just booting another OS, e.g. android? Also: why haven’t I heard of it in a while? Is it not possible on newer iPhones?
Apple disagrees hard with that, they think they are the only ones who should ever have full access. It’s easy to see why: If you have root access, you can get rid of their tracking and other data collection and avoid the ads that are shown in built-in apps like the app store.