Youtube likes is a service that adds likes to your video. Not only is it useful for increasing video ranking because it shows visitors like your video, but it also increases audience trust.
Yes of course, a video with 100 likes will look very different from one with 10,000 likes. Your video is obviously favored by the audience.
Youtube likes are also an indicator by Youtube that shows the audience’s liking for the video – which in itself is an indicator to increase the ranking of your video.