Chinese automaker BYD has surpassed Tesla to become the world's largest electric vehicle (EV) maker in 2025. BYD reported selling 2.26 million EVs, a significant increase, while Tesla's deliveries fell to approximately 1.64 million units, marking its first annual decline. Factors contributing to Tesla's drop include increased competition, production disruptions, and the phasing out of US tax credits. BYD's growth is attributed to R&D investment, advanced technology, and a strong domestic and growing international market.