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Introducing Sharing Rules
First let's see what we can do with sharing rules. Sharing rules let us make automatic exceptions to organization-wide defaults for particular groups of users. We've already defined several specific groups with the roles that we created in the previous section, but we can also make up other groups as needed.
The thing to remember with sharing rules is that, like role hierarchies, we can use them only to open up record access to more users. Sharing rules and role hierarchies can never be stricter than our org-wide default settings.