SAP NetWeaver is an integrated technology platform that helps in the integration of data, business processes into SAP environments. SAP NetWeaver is built on ABAP, C, C++, and Java languages.
SAP NetWeaver is a runtime environment for SAP applications like Supplier relationship management, customer relationship management, supply chain management, enterprise resource planning.
In case you are interested in SAP NetWeaver, I recommend this SAP NetWeaver training by Intellipaat.
You can watch this video on lean basic SAP skills to know more about SAP: