A viral video is a type of video that is shared through internet using different means like video sharing websites like Youtube, social media sites such as Facebook, Google + and through email.
Here are few guidelines that are to be considered while creating viral videos:
Try to keep the video short and tight by cutting it down to 3 minutes.
Try to hook the audience in first 30 seconds.
Share a story or your message and try to make a personal connect with the story.
Make the viewer as hero.
Provide 20 seconds for the viewer to execute the “call to action”.
Background music of the video matters a lot and try to score it in a pleasant way.
Branding name or giving title to the video is key for success of video.
Try to hook audience by thumbnails.
Focus more on emotion and don't afraid to polarize.
Use smart typography that comprises different text styles and fonts.
Finally share the video on social network to reach more number of viewers.