Multiple user accounts on one website: is it possible with Drupal?
In short: yes, it is!
In the administration panel, you’ll have the ability to assign roles to each one of your users. Each role will have its own permission set, specified access to resources and thus, functionality. As such, you’ll be able to precisely assign users and roles to meet your business hierarchy.
Drupal has no limits when it comes to user count. This is perhaps one of the reasons why it’s often deployed in government and higher education sectors – in other words, in environments, where dozens, if not hundreds of people contribute to the same website simultaneously.