like Dave says, eCart is purely the shopping cart porting of a store.
It can be used in a static or dynamic setting.
if you are creating a dynamic store, you can use DataAssist to create the search results and product detail pages.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.