Chinese team TaiG has released an iOS 8.3 untethered jailbreak tool on Windows for suitable iPhone, iPad and iPod touch devices. TaiG alerts that some jailbreak tweaks are not compatible with iOS 8.3 as Jay Freeman (saurik) has yet to update Cydia Substrate/Mobile Substrate to be suitable with the latest jailbreak. An iOS 8.3 jailbreak device for OS X has actually not been launched.
Jailbreaking enables iPhone, iPad and iPod touch users to install unapproved third-party apps, tweaks, mods, customized themes, utilities, and other content (called “bundles”) from Cydia, which is basically an App Store alternative for jailbroken devices. In other words, jailbreaking allows users to more customize and boost their iOS devices beyond the limits that Apple enforces.
It is highly suggested that you support your data through iTunes or iCloud prior to attempting to jailbreak your device, as there are numerous problems that could require downgrading or recovering your device and lead to information loss.
TaiG provides more info on its Twitter and has actually published step-by-step directions on how to utilize the iOS 8.3 untethered jailbreak on its site.
TaiG 2.0 supports iOS 8.1.3 – iOS 8.3.