Where is the cache?

[Dave Lers]

Ok this might be a dumb question but my logs have a lot of messages like
"Cleaned cache of 49 RRsets", there's also the ncache_tt, which implies stuff
is being cached on my box, where is this cache?

I'm wondering what resources are being used and how running a caching
only (not an option for me but I'm curious) or forwarding DNS compares? Am I,
as a single user, better to forward user queries to my ISP's DNS?