Some startup ideas, anyone can relate to. A new social network, a smartphone-based door key, an new calendar scheduling app. Some startup ideas are in industries that are a bit more esoteric.
For a general audience, you need to take it nice and slow at the beginning. Explain the current process, the current situation, and the current problem, and then [boom] comes the innovation. For investors in the know, you can start with [boom] directly (production costs per hecto liter are now a mere $35.50 without any chemical waste, can you believe it?).
But if your novice audience is reasonably intelligent the pitch for both the novice and the experienced audience is pretty much the same after the [boom] slide.
For example in the medical field: it takes years and years and years to become a qualified doctor. Doctors know a lot about a lot of things. One tiny, tiny, tiny subsegment of medicine can be understood reasonably well in 15-30 minutes.