When you sign up for a new account, an account is created with new Organization Account structure with a unique organization ID. The Organization Account follows the below organization structure. P1 has full access to all the organizational resources and P4 has the least access.
As the signed up user is the first user of the Organization Account, the Super Admin role is assigned to signed up user by the default. The Super Admin can assign the Super Admin role to other employees up to 4.