Question - What is NetWeaver?
Answer -
NetWeaver is an integrated technology platform such that all the products in the mySAP suite can run on a single instance of NetWeaver, known as SAP Web Application Server (SAP WEBAs).
The advantage of using NetWeaver is that you can access SAP data using the web (HTTP protocol) or even mobile. Thus, you can save on costs involved in training users on SAP Client-side GUI.