What the heck is Bunco?

I was invited to sub in for one of the ladies in a neighborhood Bunco group. My first question was ….What is Bunco? It ends up just being a game of pure luck where you roll three dice trying to get a specific number. You get a Bunco or 21 points when all three of your dice show the desired number. It is really just an excuse for women to get together to drink, eat and talk. I usually like some strategy in my games but I can’t imagine getting a group of women to focus on much more than rolling dice. Talking was priority one.