You are 2 co-founders, or have both worked on a big project, and/or could not really decide who gets to shine in front of the audience and want to give a shared presentation. You can either split up the deck and go one after the other, or, try doing it as a true duo: presentation the slides together.
The latter option is tricky:
You very little room for improvisation or the hand over to the second speaker will go wrong
The audience needs to lock into 2 different presentation styles
It requires careful scripting…
…and a lot, lot, of rehearsing
As a result, most duo presentations feel a bit unnatural. Make a video of your rehearsals before making the final decision to do it