Online Videos breaks down a big complex chunk of information into understandable visual bits. Making information more visual automatically makes it more appealing. If a picture is worth a thousand words. How many words is a video worth then?
Animated explainer videos are more fun and interesting. Interesting contents gets shared and talked about. Thereby getting more people to talk about you.
Google just loves videos. The more the audience love your video, the more search engines will love your video. Better videos mean better SEO score.