YouTube is a world's largest video site. In that site, more the 100 million users use that site. In which you can view videos related to the field required to switch off.Download videos from YouTube.
Download your favorite videos that are slightly more than difficult to do. But, you can download very easily by this site. http://www.keepvid.com/
You need to go here and click Download to paste the video URL specified in the Format, you need to download ( Download Videos from YouTube and Facebook).
Similarly, you can Download Facebook videos same as this format.