We know Taxonomy is a powerful core module and helps us categorize the content. A vocabulary in Drupal is essentially a container for terms that are used by the system. These terms are what Drupal uses to connect certain areas together within the website.
How do I create a role programmatically in Drupal 8+
//your data array
$data = array('id' => 'client', 'label' => 'Client');
//creating your role
$role = \Drupal\user\Entity\Role::create($data);
//saving your role
$role->save();
In my case, I wanted to be able to auto-create multiple roles ("clients","managers","salesrep") to work with my custom module.
This is how I auto-create roles programmatically in Drupal.