Agreeing with @anil_umachigi
Edge Network is the new way to send data to the Experience Platform. It replaces the legacy libraries for Visitor ID service, Adobe Analytics, AAM, and Target. The new WebSDK alloy.js library bundles all of these. Well it does not exactly bundle them, it allows sending bundled requests into the Edge network, which then will forward the requests to the tools connected to your datastream and in the response also contain information from e.g., Target about to-be-rendered activities.
Server-side forwarding is a separate SKU you can license. Same as in GTM, the container incurs cost. Best you contact your Adobe support / success manager to make an inquiry.
Cheers