Configure which permissions are included in a particular permission level (except for the Limited Access and Full Control permission levels), or you can create a new permission level to contain specific permissions.

Default permission levels are predefined sets of permissions that you can assign to individual users, groups of users, or security groups, based on the functional requirements of the users and on security considerations.

SharePoint Permission levels are defined at the site collection level and are inherited from the parent object by default.

User permissions and permission levels in SharePoint

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