This document summarizes a technical seminar presentation on automobile differential systems. It introduces differentials as integral parts that allow wheels to spin at different speeds during turns. It describes the manufacturing process, key parts like pinion gears and spider gears, and functions like torque multiplication and power direction change. It also discusses drawbacks of open differentials and different types of differentials like locked, limited slip, and electronic differentials. The document outlines maintenance steps like regular oil changes and provides disassembly procedures. It concludes that differentials supply equal torque to wheels while allowing different rotational speeds.