I took multiple CS classes at a top university* and I never heard about message buses or events... Admittedly I was not a CS major and don't work in software e

I took multiple CS classes at a top university* and I never heard about message buses or events... Admittedly I was not a CS major and don't work in software engineering. (To be honest, it being a top university probably decreased the probability that they would teach me practical/useful engineering practices like this. The programming classes I took were fairly focused on more theoretical concerns)