Bootstack vs bootloader topic

So I'm currently on cloudy g3 and have twrp 2.8.5.1. I'm not bumped, I am loki-ed.

I want to install blisspop Rom but it requires 12b bootstack.

My question is how do i know if I have that or not, and what's the difference between a bootstack and a boot loader?

Sorry for the noob question. And thanks for any help
-art