# Tag Overview

Tags identify EVS resources for purposes of easy categorization and quick search.

Table 1 Tag overview
Operation | Scenario
--- | ---
Adding a Tag | Add tags for existing disks or during disk creations.
Modifying a Tag | Change tag values for existing disks. Tag keys of existing disks cannot be changed.
Deleting a Tag | Delete tags that are no longer needed for existing disks.
Searching Disks by Tags | After tags are added, search for disks by tags.

Parent topic: Managing a Tag