I will download youtube videos from the app tubemate one of the best app for downloading videos. This app creates videos of different quality like 3gp, mp4, hd quality etc videos. This is very simple to use and fast downloading. If anyone wants to store youtube videos i.e. downloading I will suggest tubemate. This is not availale on google playstore but we can directly get this app from internet. It is better if it brings out remove adds feature which always blinks on the screen. Rest all are perfect.