Whiteboard videos create for the viewer a visual and oral narrative of a new idea, often by confirming an old idea or problem first. One of the most successful ever was dropbox's, performed by Common Craft.
Producing these are more cost effective than you might think ($500-1000 for a one minute video. Frontier recently launched a report on digital fundraising best practices and employed an artist to create a whiteboard video to make the pitch to visitors. Check it out: