If you want to download playlist in mobile phone so vidmate app is used to download the playlist. Although other apps are used to download the playlist in android but we will use Vidmate to download YouTube playlist.To download a playlist you need to make just a couple of steps:
Open the app and select the YouTube option.
Search the require playlist as you want to download. And select the playlist option.
In this step select the playlist as you want to download and click on arrow button.
In this step all the videos of playlist will appear select the videos as you want to download. And tap “Done”.
In this step select the video quality and click on download option.