What is the difference between these 3 roles in a Classic Software Project?

[vildana_ermaya]

I created a new Classic project to manage a data science team and when I go into project settings/people to add people to the board I get 3 role options:

-Administrators

-Developers

-Stakeholders

I'm not really sure what the difference is between the 3 in terms of access to the board and overall what each allows to do in the board. I have the data scientists temporarily set as developers but not sure if that makes sense. 

[Mikael Sandberg]

These roles can be used to control what users have access to in the project by setting project permissions based on the roles, in workflow conditions, notification schemes just to mention a few things. Have a look at Manage project roles for more information.

[John Funk]

To me it all depends on your Permission Scheme and what is granted to each role.