IOS jailbreak - unauthorized access to the file system of iPhone, iPod Touch, iPad or Apple TV, likely due to exploits that exploit Apple's security vulnerabilities. Access to system files and folders allows the user to manage their content and install applications from third party sources, ignoring the official source of iOS content in the App Store. Users of the "jailbroken" iPhone, iPod touch or iPad still have access to the App Store, iTunes and the basic capabilities of the device - for example, a phone call.
The main function of jailbreak is to modify (simplify or expand) the iOS options and personalize the device interface. In order to download a jailbreak to an i-device, you need to install a utility compatible with the iOS version.
Literally "jailbreak" (English jailbreak - "escape from jail") means "exit" of the device beyond the boundaries of its own "cell". At the beginning, the metaphor of a cell, or jail, refers to the UNIX operating system, namely the FreeBSD jail - autonomous virtual "cells" within one FreeBSD operating system.
The ability to install Cydia
Jay Freeman, also known as saurik, is the father of Cydia, the most popular alternative content source on the App Store, as the founder of jailbreak. Thanks to Cydia, you can install software on your iPod Touch, iPhone and iPad that is not in the App Store, download a paid app for free, or an app that is not approved or has been removed from the App Store.
The Cydia icon appears on the display of the device immediately after jailbreak. Cydia is so ubiquitous in jailbreak communities that most of the tools you use to jailbreak automatically install it. There are a huge number of abilities that jailbreak tweaks open: from configuration of the design (status bar, font, design theme, icons) to installing additional options and managing integrated functionality (disabling background processes, cleaning the RAM, reading changes to system files and folders, etc.) etc.).
Ability to edit system files
You will not be able to edit system files and folders: move, copy, rename, delete or create new ones. iTunes is the only manager to manage your Apple device. The App Store is the only source of apps. Modified, or "cracked", using a jailbreak, the system is available for editing. From Cydia you can download and install file managers specifically on your device or computer. Here are just some of the iOS file system content management capabilities: