Jailbreaking, what is it ?
The iPhone, iPod touch, iPad & Apple TV hack that allow users to gain access to the entire Unix filesystem. In Unix terms, this refers to changing the root of the directory tree to /. By jailbraeking you gain access to areas of the iPhone, iPod touch or iPad that users aren’t supposed to mess with. Typically, this is an immediate prelude to either installing cool programs, unlocking the handset for use with another cellular network, or both. Through jailbreaking, you are able to add additional applications to your iDevice. It allows you to do so by adding an application called Cydia to your iDevice. It also allows modding (changing) of your iDevice application icons, wallpaper, dock, status bar, chat bubbles, weather backgrounds, keyboard….etc.
On the Download page all available versions of the jailbreak software, like RedSn0w and Snowbreeze can be downloaded.
Cydia
Cydia is like the App Store, it’s lets you install applications right to your device without a computer. Really, the correct way to say it would be the App Store is like Cydia because there was Cydia before there was the App Store. There was also an app called Installer before that, but now Cydia has taken over as the best program to use to get jailbroken apps onto your iPhone or iPod Touch. Anyway, basically the App Store works just like Cydia.
Winterboard is the application that allows you to change the look of things on your iPhone. We’ll use this a lot later when we look at modding your iPhone. Basically it lets you install different themes or visual changes to your device.