Is it required that my AdVision eCommerce system connect to a separate point-of-sale or inventory management system?

No, it is not required.  AdVision eCommerce is built as a standalone system that can both manage your catalog and process/manage online orders.  It also contains basic inventory management features.

However, many of our clients do require a more advanced inventory management system and/or point-of-sale application for their brick-and-mortar store.  To this end, AdVision eCommerce does currently support several POS/inventory management systems and is always open to connecting with new/additional systems in the future.