[xm177e2]

The Nazi regime in Germany used the camps to kill six million European Jews

The camps were used to kill five million Jews, an additional million were killed by the mobile Einsatzgruppen. And a lot of other people (gypsies, gays, communists, resisters, etc.) were also killed or put in concentration camps.

[weegee]

Yes, while the 6 million Jews make up the largest single group, I found it odd that the article seemingly dismissed 5 million people as "numerous":

The Nazi regime in Germany used the camps to kill six million European Jews as well as numerous resistance fighters and members of political parties opposing Adolf Hitler's rule.

[ snip ]

About 18 million people were imprisoned in such camps during the Nazi regime of which 11 million died, estimates show.

I've seen that total dead figure also as ~10million in the camps.