How to use of ALV programming in SAP ABAP?

ALV stands for Application List Viewer in SAP ABAP. ALV programming used in SAP ABAP to enhance output of a report using dedicated ALV function modules. These function modules improve the functionality and readability of any report output. ALV is really helpful in arranging the columns in a report output. Most used ALV function module is REUSE_ALV_GRID_DISPLAY.