Tesla makes electric vehicles and the energy products that surround them. Its car lineup is produced in factories across the United States, China and Germany, supported by a proprietary fast-charging network that other automakers have begun to adopt. The energy division sells Powerwall home batteries and utility-scale Megapack storage. Software matters as much as hardware here: Tesla sells driver-assistance features as paid upgrades and pushes improvements to its fleet over the air. Vertical integration, from battery cells to sales without dealerships, sets the company apart from legacy carmakers.