Why do we install a library via pip and again add it in pycharm under project settings?

Question

I installed the selenium package via pip and again in the pycharm ide.

Why do we add the selenium package under the project setting? What is the difference between these two?

Answer 1

Pycharm redirects to calling pip internally. The only difference would be that Pycharm allows you to set project specific interpreters, which you'd need to first manually activate in the terminal in order to install packages to them, rather than your default/system interpreter