First, what does rooting Galaxy S4 mean?
Rooting Galaxy S4 means that you gain admin access to your phone, sorta like having admin access/username for your Windows/Mac/Linux computer. In layman’s terms, you are basically getting 100% control over the Galaxy S4 you already paid for.
What does rooting Galaxy S4 do for you?
You will be able to run rooted app such as the DSLR Controller app, which requires root (or full admin access) and you will be able to use your Galaxy S4 as a Liveview monitor for your Canon DSLR camera. This is just one example where root can unlock potential of your Galaxy S4.
Titanium Backup app allows you to backup all of your apps and restore them easily. This is very useful for installing custom ROMs on the Galaxy S4 as sometimes you may have to reset your Galaxy S4 and restore all of your apps.
Another great way is to use Titanium Backup app is when you are upgrading your Android smartphone. Let’s say you upgraded from a Galaxy S3 to a Galaxy S4, then you can use Titanium Backup app to backup all of your apps on your Galaxy S3 then restore them on your brand, new Galaxy S4.
Those are just few examples what a rooted Galaxy S4 but you can also install custom ROMs on your Galaxy S4.