DOWNLOAD/SAVE YOUTUBE VIDEO WITHOUT ANY SOFTWARE OR ANY CODES

Its just a trick to save youtube video from browser cache files..

1.Goto youtube website...
2.Click the video which you want to download...
3.Then play the song....
4.After that goto cache folder

For chrome,
C:\Users\Administrator(Select your user account)\\AppData\Local\Google\Chrome\User Data\Default\Cache
Then right click->sort by->size
(For other browser this location may vary ,just do googling...

5.The files which starts with "f_" is your video file(ex: f_000f11)...
6.Then rename those files with extension .flv(ex: f_000f11.flv)
7.Double click that file to see the video.(flv extension is playable on VLC media player and like them)

For any doubts or if  you dont know about your  browser cache file location feel free to give a comments..........