Subdomains are a way of creating separate websites within your master web hosting account which are accessed as separate URLs. For example, you could set up a "loginpanel" subdomain on your master web hosting account "yourwebsite.com.au", which would be accessed as "loginpanel.yourwebsite.com.au". Many larger businesses use subdomains to establish branding and focus on separate product lines, because a subdomain creates a separate URL and web presence.