Jailbreaking is the process of removing restrictions in iOS, and allow root access to the iOS file system so that it can run software that has not been approved by Apple. It allows users to install jailbreak apps, tweaks and themes from Cydia to customize the look and feel of their device, and also enhance the functionality. like Root on android .
See here how to jailbreak any device using IOS9
See here how to jailbreak any device using IOS9
