Towelroot is a root tool that will let most Android smartphones users to root their Android device with one click only, as long as it has an unpatched version of the Linux kernel. The tool exploits the same vulnerability (CVE-2014-3153) which was recently disclosed by the hacker Pinkie Pie in the. Linux kernel version 3.14.5 and most versions of other Android devices, which could be leveraged by hackers to potentially acquire root access on affected devices. It is just like operating an administrator account on a computer. Having root access of your device simply means you make System-level changes to your device.
Source: https://thehackernews.com/2014/06/towelroot-one-click-android-rooting.html