These companies existence have become essential to all our way of life. Without their products most of the technology we have right now would probably neve have existed. Tsmc silicon chips are needed in all electronic machines and all the rest of the big four have all done business with them for their chips. Intel used to be the king of cpus for years in computers and now are getting into graphics cards. Most laptops and computers use their cpus in those systems. AMD is the underdog of the chip manufacturing companies. With their new ryzen chips they stole intel's domicile and now have a good alternative to intel and also with their rx6000 series their graphics cards can compete with nvidia and are solely taking over the market share. Nvidia is still the king of graphics cards and their gpus performance is almost unrivaled. Many systems use their cards for gaming up to video production. These companies are the big four of the computer hardware industry and without them maybe computers wouldn't be as fast and efficient as they are now.