Ask HN: Good topics to “talk about coding” to a marketing department?

I'm a full stack dev (one of two) at my company. I work mostly with the Marketing dept and they have asked me to do a quick five minute talk "about coding" so that the team can in some way understand what I do.

What are good topics to cover in such a short time to entirely non-technical people?

This is about talking about interesting subjects, it's not me justyfying myself.