I was watching this https://www.youtube.com/watch?v=Iz2ie3i1Gh0 about Ads/CFT. Very nice video from the master himself. I got confused though about what he calls $N$. Basically he says $N$ is the number of fields and that it should be $N >> 1$ for AdS/CFT to work.
I thought $N$ in this context usually means the number of super symmetries. Is he just being confusing? Sloppy? Or what's going on?