Tesla aims to transition the world to sustainable energy through its fully electric vehicles and solar panels. It uses a direct sales model without dealerships and invests in technologies like its Supercharger network. While Tesla has grown its market cap to $139 billion and continues to increase deliveries of its Model 3, Model X, and Model S vehicles, it still faces skepticism as no new automaker has succeeded in over 100 years and Tesla has yet to turn an annual profit.