What does the term "jailbreaking" refer to?

Jailbreaking refers to the process of removing software restrictions imposed by iOS, allowing users to gain root access to the operating system. This process enables users to install applications and tweaks that are not available on the official App Store, modify system settings, and customize their devices in ways that Apple does not typically allow.

By bypassing Apple's built-in security measures, users can utilize features that are restricted by default, which can enhance the overall functionality and user experience. However, jailbreaking also introduces risks, such as exposing the device to malware and voiding warranties, as it breaches the manufacturer's intended limits.

In contrast, the other options discuss topics not relevant to jailbreaking. Modifying hardware for performance, securing devices, or improving battery efficiency do not involve circumventing software restrictions, which is the hallmark of jailbreaking.