Since it first appeared, the term "jailbreaking" has been used to refer to adapting the code on numerous other devices, from phones to games consoles.
Meanwhile, Apple has repeatedly fixed jailbreak exploits with successive updates to its mobile OS, and you'll usually have to pause automatic iOS updates to apply a jailbreak.
With iPhone apps now given more access to the OS, jailbreaking is less popular than it once was, and most people won't ever consider doing it.
You will certainly void the warranty on your phone if you jailbreak though, so if something goes wrong you've basically got no safety net to fall back on.
If you're going to dive into the world of jailbreaking, be prepared for a little bit of trial and error - the process isn't quite as smooth as downloading a new update from Apple.
Speaking of iPhones, here's what we're expecting from Apple's next handset