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A resource is an item that a teacher can use to support learning, such as a file or link. Moodle supports a range of resource types which teachers can add to their courses. In edit mode, a teacher can add resources via the 'Add an activity or resource' link. Resources appear as a single link with an icon in front of it that represents the type of resource.
Administrators can decide whether or not to force teachers to add descriptions for each resource by enabling or disabling a site-wide setting in Administration > Plugins > Activity modules > Common settings.
...and this one is a "Text and media area" resource!