SAP ABAP (Advanced Business Application Programming) is a high-level programming language created by the German software company SAP. It is used to develop business applications for the SAP R/3 system, which is a widely used enterprise resource planning (ERP) software. ABAP is primarily used to develop custom reports, interfaces, and enhancements for SAP applications. If you're interested in learning more about SAP ABAP, I can provide you with some resources or information.