By definition, a commercial web site refers to any site providing people with remote merchant products and services. The final goal of these web sites is to sell these products and services to any potential visitor. They typically support interactive tasks in both the professional domain, such as trading, brokering, filtering, consulting, teleshopping, and electronic commerce, and the private domain: self or home banking (e.g., account management, cash deposit and transfer), insurance management (e.g., follow-up of a current insurance policy), on-line shopping (e.g., buying a gift), etc.
Vanderdonckt, J. (1999). Commercial web sites made accessible for all. In Hans-Jörg Bullinger, Jürgen Ziegler (ed.), Human-Computer Interaction: Communication, Cooperation, and Application Design (p. p. 838-842). Lawrence Erlbaum. https://hdl.handle.net/2078.5/259471