A DNN portal is an entrance to a website. The DotNetNuke portal has many advantages.
Each portal has a domain name such as www.comstar.biz. If you wanted to buy a different domain name, under a shared hosting environment, you would then need to buy another hosting package. This could become costly for your business. When you use a multiple DNN portal system, you have a single hosting account for your many domain names. Your site will have a portal for each domain name.