They can be described as nicknames of servers, since their purpose is to make web addresses easier to remember than the numerical addresses most Internet Protocols use to identify services. The numerical address is called an IP – Internet Protocol – address. The domain name for this website is wporb.com. When you enter the domain name into your browser address bar and hit enter, the domain name gets resolved to the IP address for the server the site is hosted on, which your browser then connects to.
If you’re running a self-hosted WordPress site, you can use it with a domain name by registering one through the web host your site is hosted on. WordPress.com also offers domain registration for users of their service. Domain names are renewed and paid for annually, and the most common ones, like .com and .net, usually cost around $10 per year.