Videos are an effective medium for emotional appeals by showing enthusiasm, visual demonstrations, extending communications remotely, and generating quick interest in topics. Most online videos should be short, around 3 minutes, to keep viewers engaged as the average view time is only 3 minutes. When creating a short video, it should concisely cover what the topic is, why it's important, who cares and benefits, and include a clear call-to-action for viewers in under 3 minutes.