Is this website's URL a TLD or a sub-domain?

This website's URL is a TLD (Top Level Domain), not a sub-domain. A sub-domain's URL starts with "www." while a TLD URL ends with ".com". My website's URL does not start with "www.", but ends in ".com", making it a TLD.

What is this website about?

This website gives people who are interested in playing the violin all the information they need to start.