Promotional video
From VNDev Wiki
A promotional video (also known as a promo video or a PV) is a video used to promote or advertise your game. In general, a promotional video for a visual novel will include a short overview of your game’s plot/premise, introduce characters, or show gameplay. Bigger projects may find it worth their time to do separate videos for each element and smaller projects may decide to just create an opening video and use that instead.
