Users can be allowed to perform various actions on the site via permissions.
Many permissions refer to a particular resource, for example a file. Resources permission group will typically have four separate permissions. View, create, update and delete.
Lets take file as an example:
View - Would allow user to preview file contents on the site.
Create - Would allow user to upload files on the site.
Update - Would allow user to modify uploaded files.
Delete - Would allow user to delete uploaded files.
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