What automobile system has produced the greatest changes in today's automobile?

The advancement of electric vehicle (EV) technology has produced the greatest changes in today's automobile industry. This includes improvements in battery technology, which have increased range and reduced charging times, and the integration of sophisticated software and electronics for enhanced performance and connectivity. Additionally, the shift towards EVs has prompted significant changes in manufacturing processes and supply chains, as well as a growing focus on sustainability and reducing carbon emissions. Overall, the transition to electric propulsion is reshaping the future of automotive design and consumer preferences.