Although YouTube is intended for video streaming- watching the video online in real-time, rather than downloading the file- there are now very easy and straightforward ways to download the videos instead, and you can do this in a number of formats including MP4.
The benefit of downloading is that you have the file to keep, and can watch it any time. You don't even need to be connected to the internet. You can also save to external media and transfer to other computers. Remember, though- the content in most videos on YouTube is owned by somebody else, and therefore there could be legal implications in downloading and sharing the file.
One of the easiest websites which enables the conversion of a YouTube video into MP4 is ClipConverter. All you need to do is paste the URL of the video you want from YouTube, select the quality and file type you desire and press start. It's as simple as that!
