Trusted Hardware Module how do I use it?

Obviously I switch it on in BIOS (drum roll cymbal crash) but what about the other things.

I read luks uses it in some way for disk encryption. How does that work?
Would this be something that aids in encrypted email?

I appreciate input. I bought the chip on a whim now I wonder if I should use the thing.

I take it that this is a hardware security device more than a software device. Am I wrong?
Yeah I'm not sure what do do. What do you think?!