A video wall is a combination of 2 or more screens or panels which have been mounted in a rectangular arrangement.  They operate together as one large canvas for displaying digital signage and video content.  

Setting up a video wall is relatively straight forward providing some basic preparations are made.  Please see the following link for detailed information about how to set up a video wall: https://www.signstix.com/support/tutorials/setting-up-a-video-wall/