Throwout bearing self aligning or standard

Never heard of either of those terms used in association with a throw out bearing.

I asked this same question about a year ago and got the same answer. LOL

The reason it is being asked... or my reason for asking...

When I went to a chain parts store, NAPA, they asked me if I wanted self aligning or not. In the end I got a clutch kit that came with the throw-out bearing.... I still don't know.