A easy to use, free, online site to download YouTube videos using the website address of the video you want.

It will give you a choice of what file format you want to have on the video download–

SnipSnip.it : This website allows you to clip a section from a YouTube video and share that section with others. No registration is required. You will just paste the link from your YouTube video, select the start and end times for the section you want and SnipSnip.it will generate a link and an embed code that will play just the section of video you selected. With SnipSnip.it, you can have the video on a blank screen without the distracting and sometimes inappropriate “related videos” that appear on YouTube itself.