It can be any company or person that makes an unfinished product, finished…. It’s that simple really. It could be the company that produces things you find in the supermarket shelves, retail outlets, car showrooms… or even Japanese restaurants that serves you Ebi Tempura set from prawns they have caught/gotten from the sea/wet markets.
In a nutshell, the manufacturer is someone whom has created a product that delivers value to consumers like us, by transforming raw materials to a finished product that is ready for consumption