A domain name is like yourbusinessname.com or yourbusinessname.com.au.
If you don't have a domain name AppBubba Web Design can get a domain for you for around $26 per year or you can purchase it yourself if you like.
If I get it for you it will be under your business name so I will need your ABN if you would like a .com.au domain name. I will pay for it then pass the cost on to you.