Difference between Role Hierarchy and Territory Hierarchy in Salesforce?

Role Hierarchy	Territory Hierarchy
User is assigned to one role.	User is assigned to multiple territories.
An account is owned by single user.	An account can belong to multiple territories.
User has single forecast.	A user has forecast for each territory.
Account owner and users above role hierarchy and those who have access to child records can access account	An account is accessible to all users in territories, as well as users above them in territory hierarchy.

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