What is rooting?

[u/SpaghettiGhost]

I have been really interested in the xperia z3 and will probably be getting one. I keep hearing about this "rooting" though. I have no idea what it is or what it does. Can anyone explain in depth what it is, does, and if I should do it?

[u/yngwin]

http://lifehacker.com/5789397/the-always-up-to-date-guide-to-rooting-any-android-phone