Some years ago it was kind of tricky to download a song from youtube. Nowadays, there are many options to download the desired data file. In the world wide web you can find a lot of providers who offer you a converting- and download service. With these applications you are able to convert every youtube song into the required file format.
Fortunately, almost every Youtube Downloader is completely free to use. The only thing you have to do is to copy the link of the desired mp data, insert it into the input box and start the process. In most cases, after the converting-process is finished you can start the download with one click, in some cases the download starts automatically.
Before you start the process, you are able to choose the required file format. Depending on the provider there are different file formats available.