Final answer:
Jailbreaking is the process of unlocking an iPhone or iPod Touch to install third-party applications and customize the device.
Step-by-step explanation:
The term jailbreaking refers to the process of unlocking an iPhone or iPod Touch to allow the installation of third-party applications that are not approved by Apple.
This process involves bypassing the restrictions imposed by the device's operating system, enabling users to customize their devices and access features that are not available through official channels.
By jailbreaking, users can install apps from sources other than the App Store, customize the appearance of their device, and gain more control over its functionality.