Key difference between System Administrator and System customizer role

Security role describe difference between different users in dynamic crm i.e. user is System admin, salesperson etc. Its use to control access to data. A user can have multiple security roles.

Key difference between to common roles System Administrator and System customizer

System Administrator	System customizer
System Administrator have Organization level access to system entities	System customizer have user level access to system entities
We cannot customize system Administrator role	We can customize system customizer role
No restriction on any entity	Restricted access (Create/Delete) to Plugin assembly, SDK Message Processing Steps, Service endpoints, Web resource, System Job, Calendar, Business Closer, Business Unit, Currency, Security Role, Team, User Impersonation, Override Created On, Enable/Disable User, Audit Partition, Bulk Delete