What is the difference between the output medium slide and screen at OpenOffice?

I want to create a presentation and I'm at the above Not sure what to choose. Of course I want to create the presentation on the laptop, which I will then use in the presentation. However, the presentation should already be projected onto the wall using a projector.

In this case, what do I choose as the output medium?

Complete your presentation - connect your laptop with the projector - then you can start the presentation with a screen presentation or with f5. Mfg.m.