Sometimes you need to download a video to show to your class. The site, YouTube, Facebook, Vimeo, etc. could be blocked at school, bandwidth could be an issue, or the ad that loads at the beginning may not play due to filtering and prevent your video from playing.
Here is a simple way to download a video from these sites:
Go here: http://en.savefrom.net/
Enter the URL of the video in the box and click download. It will give you anywhere from 1 to 5 or 6 options for download. I recommend using the MP4 version.
That's it. Some videos may not download due to privacy or other issues, but it works for most.
It works YouTube, Vimeo, Facebook and others.