Nikola Tesla was an electrical and mechanical engineer whose genius fueled the second industrial revolution. His most famous achievement was the development of the alternating current (AC) motor and polyphase system, which remains the global standard for power transmission. Tesla was a visionary who explored wireless energy, X-ray photography, and remote control. He built the Wardenclyffe Tower, intending to transmit free electricity and information across the globe wirelessly—a concept far ahead of its time. His 'Tesla Coil' became a fundamental tool for radio technology and laboratory research. Despite holding over 300 patents, Tesla died in relative obscurity, though he is now celebrated as one of history's greatest inventors.