Keyword stuffing

I want to know if keyword stuffing is a black hat technique? and can it be used when optimizing a site.

So many factors to be desired but yes it is blackhat.

Keyword stuffing is a dead method for sure. That`s one of the first black hat methods and its totally beaten by SE`s.
I often see some dudes "playin" with spamdexing on forum profiles with something like 1000 links and anchors, but that`s totally stupid. If you want to energize your links, you can submit it to scrapebox, not put all of them on forum profiles.
Greets

Probably not a good way to game the search engines in todays seo market.