It is a bit confusing for a beginner to understand the rooting operations of iRoot.iRoot has higher chances of messing up the Bootloader while rooting your Android phone.
You can root your device without internet, once you download it. Speaking of root application for Android devices using a PC, iRoot allows you to enhance device performance, uninstall pre-installed apps, and enables blocked features on your phone. 10 Best Android Root Software for PC iRoot