Di The WordPress.com Blog:
Over the last thirteen years or so, the number of sites on WordPress.com has grown — a lot. Every one of those sites gets a unique wordpress.com address. And since there are millions of sites created each year, it means the address you’d like isn’t always available.
Today, a whole new range of possibility opens up: free .blog subdomains.
What’s a subdomain?
Glad you asked! This site’s address is blog.wordpress.com. Here, wordpress.com is the domain and blog is the subdomain.
Say your name is Molly and you’re starting a food blog. The domain mollysfoodblog.wordpress.com — that is, the subdomain “mollysfoodblog” on wordpress.com — is already taken by someone. Or you’re starting a website to offer tech advice; but there’s already a site using techadvice.wordpress.com, drat!
Now you have more options: you can choose to use a free subdomain with a .blog address, like mollys.food.blog or advice.tech.blog. There’s a list of popular .blog domains we’ve reserved just for this:
These .blog subdomains work just like the regular wordpress.com subdomains — they don’t expire, they’re free to use for the lifetime of your site, and you can always replace them with a custom domain at any time.
How do I get one?
First, create your new site. In the first step of signup, we’ll ask you about your goal for your site — select only the “Share ideas, experiences, updates, reviews, stories, videos, or photos” option. In our experience, the people who select this option generally find that a .blog subdomain fits their site well. Fill out the other fields as well, and click Continue.
Now, in the next step when searching for a site address, you’ll see a free option at the top of the list. We’ll suggest a .blog subdomain related to the terms you entered in the first step. For example, if you searched for “Tech Advice,” we might suggest advice.tech.blog as an address for your site.
Click Select next to the address you choose, and you’re all set,
Your new website and its perfect address are only a few clicks away. If you start a new site with a .blog subdomain, let us know in the comments! We’d love see what you create.
FONTE : The WordPress.com Blog