Debugging is a methodical process of finding and reducing the number of bugs, or defects, in a computer program or a piece of electronic hardware, thus making it behave as expected. Debugging tends to be harder when various subsystems are tightly coupled, as changes in one may cause bugs to emerge in another. Many books have been written about debugging, as it involves numerous aspects, including interactive debugging, control flow, integration testing, log files, monitoring (application, system), memory dumps, profiling, Statistical Process Control and special design tactics to improve detection while simplifying changes. Description by Wikipedia.
Debugging in SAP is a solid bit of control every Abap developer needs to master to work the system. Functional consultants can also benefit from these articles...