STAN JONES
Fire John Harbaugh
Gonna put it in spoilers even though it aint a spoiler...after all, @Malta got mad earlier because I told him names of characters introduced 3 seasons ago
White Walkers are the dudes with the big blue eyes and white skin and ice swords. Wights are their "army," when someone dies the White Walkers rise them from the dead and turn them into zombies which are called Wights.
In season 1 when Jon killed the zombie in Mormon't room, that was a Wight. The thing that Sam killed with the dagger was a White Walker. It is unclear what White Walkers actually are, that is probably one of the major mysteries of the show.
Rewatch this scene and you can probably figure out the difference:
the show never explained any of this
i thought they all were Walkers