Shareholders are a company's owners. They have the potential to profit if the company does well, but that comes with the potential to lose if the company does poorly.
a promoter actively tries to get the word out, spreads information on (whatever they are promoting), possbily why you should invest in this or take part in that, etc. a shareholder owns a share of a (public) company, and depending on the shares, get voting rights on the direction of the company should be going in, given the choices.
