What is Rooting?

[riyaz]

what do you mean by rooting ? I already have android 4.0.4 ICS in my Xperia Go.  whats the gain in rooting?

[xfahim]

Well, in short words this can't be described.

See here: http://droidlessons.com/what-is-rooting-on-android-the-advantages-and-disadvantages/

And how to root: http://talk.sonymobile.com/message/338463#338463