It didn't tell you where (which state) or what kind of camp it was?
A lot of religious organizations do camps where the kids can do fun stuff without getting into trouble. Camping out, sitting around a camp fire, fishing, hiking, paddling a canoe, whatever.
From what I gather there are religious affiliated and non religious affiliated camps of this nature. In the US the kids get summer break so they are all pretty much at home for 3 months 'bored' and hence often their parents sign them up for a camp experience.
I live waaaay out in the country so camping, hiking, fishing etc is not new to me, but many kids in places like New York City or whatever will get sent to camps where they do stuff like live on a farm for 6 weeks or something like that. I have literally met people before that had never seen a real live cow!
Generally though it's supposed to be a fun experience where people make friends etc and the adults are there to make sure little Billy doesn't play Tarzan and break a leg or to make sure the older kids don't bully the smaller ones... and to organize and supervise their activities and games or whatever.
Think Cub Scouts or Boy Scouts only it's for boys and girls and you will probably be doing a whole lot of different activities.
I've never done it but that's my take on the whole thing.