Download youtube videos simply without using any extra application.

there are so many simple ways to download you tube  videos
different ways are
1.go to youtube and click you want to download video.
     next observe that videos url in top like http//:www.youtube.com/something/
     before "y" type "ss" then enter and it automatically take you to that video format. choose your       format and download.
2.go to keepvid.com .download you want like download /.
3.go to tubidy.com is also useful to download youtube videos