How to download YouTube videos on a Mac

Macworld
If the idea of a long car journey or bedtime without a connection to the internet leaves you trembling with fear, there’s a solution. You can download those YouTube videos your kids (or you) love to watch to play back offline. Making a copy of YouTube videos on an iPad or iPhone is really easy, but the same can’t be said if you want to save YouTube videos on your Mac.
The most curious thing about this particular issue is that YouTube allows YouTube videos to be downloaded to