A private limited company is a type of company wherein all of the shares are owned privately. This means that the shares are owned by a group of different promoters. When you say the public limited company, this is a type of company that can be available to everyone.
This means that it is not only the promoters that own the company, but the public will be in charge of what may happen to it and so much more. Take note that the companies will not work if there aren’t people who try their best to improve the way that the different projects of these companies are supposed to work.