The autoplay feature is great for situations such as parties where may want to just pick a song that you like and then let YouTube do the rest. Once your current video has finished playing, YouTube will then automatically play the next video in this populated list if you take no action.
If you’re watching a video that you like then YouTube will automatically populate a long list of other, similar videos that you may also find interesting. If you are a regular user of YouTube, then you will probably agree that one of the handiest things about it is the fact that it has the suggested videos and autoplay features.