Domains are the tools we use to view websites online. Rather than typing out a ridiculously long series of numbers, we use a domain name (followed by a domain name extension) to pull up a website hosted on a server. BlueFur offers you the ability to select the plan most suited to the number of domains you wish to host.
A subdomain is a good way to divide a website up into sections. The subdomain usually acts as a descriptive prefix to your primary domain name. For example, you could host a blog on blog.yourdomain.com. This way, you give the general public and easier way to remember where your blog is located. You can create as many subdomains as your plan allows and you are able to upgrade your plan as needed!