Script Designs can come in all types of forms. For example a shopping cart can be a script whether it's an Open Source or Purchased version. Most Shopping Carts come with themes giving a nice look and all you have to do is configure some setting in the Admin / Back end section then add your products. Some you can create your layout / design.
Scripts are not just Shopping Carts though. For example a Calendar can be added to your website with an Admin section so you can add events and so on. Some Scripts are a complete website and some are add-ons that can be added to your existing site(s).
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