GM is the world's largest automaker by vehicle sales. It employs over 200,000 people globally and does business in 157 countries. GM follows a strategy of offering "a car for every purse and purpose" targeting upper, middle, and lower classes. It focuses on reinventing itself with innovative, exciting vehicles and pursuing new energy solutions. GM's brand portfolio includes Chevrolet, Buick, Cadillac, and GMC and it aims to design the best vehicles in the world through investment in R&D.