***Here you can see the method of rooting your Samsung device...
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*First you have to Install ODIN in Your Pc or Laptop
  https://mega.nz/#!LRoUkJwB!njwUZnBWa2OKHZstVfTVySkXyEAO6dDHpOw8UB7V62k
  download from here....

*Now You have to download root file for Your device for example....

  Like I have Indian model sm-g925i so i have to download this file, and same as you have to            download this root file according to your model no...

https://autoroot.chainfire.eu/

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2nd Step:

Now You have to run download mode by pressing "POWER BUTTON+HOME BUTTON+VOLUME DOWN BOTTON" it will look like this...

Now Install Samsung usb driver

http://www.cydiaos.com/download-samsung-galaxy-s6-usb-drivers-edge/

Now Connect your phone with your pc or laptop and open ODIN software

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Now Hit "AP button" and add ROOT file and Hit "START"

It will take some time and boom your phone is completed, install root checker and check :)

For Custom roms please subscribe my channel..

https://www.youtube.com/watch?v=FZ27J6cYrBA

For any Question please comment here :)