Drink much? I do occasionally and I personally love whisky the most.
I just learned that whisky is made from fermented grain mash. 
Really? I never knew that! Maybe that's why I like it so much haha.
Yeap, they use different grains to make it taste different.
So different grains make different whiskeys? 
They do. Then they age it in a wooden cask that is made of charred white oak normally.