How  to Download youtube videos  without any software. you can easily do that after reading this

1=Go to Youtube.com and select the video that you want to downlaod.

2=After that click on that selected video.

3=And last go to the top part of that page and in the url part of the video just type ss before youtube and then 

click 

4=Now you have many file format to download this video so you can click  any offthem.

5=Finally your downlaoding will be start.