The program operates from an interface similar to any tab-based browser, the only difference being that there are always three tabs open. The first allows you to browse YouTube just like you would using a normal web browser like Chrome or Firefox, and the second has a list of all of the videos that you've already downloaded so that you can watch them. The third tab keeps track of any downloads still in progress.
When you download a video, you can choose between getting it in its original format, or downloading it in one of many different formats supported by the program - even some formats that make it possible to view the video on a console or smartphone. And you can also select the quality of the video.
Leawo Free YouTube Downloader is a pretty comprehensive video downloading tool. The only downside to the program is that if you save a video in a format other than FLV, it will add a watermark to the result. Still, the program is capable of a lot and is very easy to use.