A domain name comprises four parts: the subdomain, domain, top-level domain, and extension. The subdomain is the part of the domain that comes before the domain. For example, in the domain name www.example.com, \\"www\\" is the subdomain. The subdomain can be used to identify the purpose of a website. For example, you might have a website for your business as well as a website for your blog. In this case, you would use two subdomains: www.example.com and blog.example.com. The domain is the part of the domain name that comes after the subdomain and before the top-level domain. In our example above, \\"example\\" is the domain.