As prevalent as having a website that is reachable at your own domain (as opposed to a subdomain like yoursite.something.com) has become in recent years I still come across sites whose address is on a subdomain. Besides being harder to remember, subdomain sites typically have ridiculously long URLs that are likely to get clipped off when shared on other websites. So there are definite benefits to moving to your own domain from a subdomain.
If you have an address at a subdomain it’s likely that you have built your website (or blog) using a hosted service such as WordPress.com, Blogger or Squarespace, to name a few popular services. There was a time not so long ago when using a hosted service meant that you were stuck at your subdomain. Thankfully those days are over. Just about all the key hosted site/blog services offer the ability to use your own domain, although a small (~$10 per year) fee is usually required. Fee or no fee, it’s worth it to have your own unique web address that is unencumbered by the name of the service that you are using.