What's a Farbrengen

I reach for my Keyboard. I glance at the clock - 10:30pm. I'm tired. Got to explain what a farbrengen is. How does one do that with just words? Hand on mouse. Eyes on screen. Judaism. Click. Chassidism. Click. Chabad. Click. OK, what now? Let's see... History, no. Literature, no. Lifestyle, maybe. Click. Farbrengen... Bingo!