Quarantine
The Quarantine section is in the Web Console under 
More > Quarantine. This section shows all files quarantined on client devices.
You should quarantine files if you cannot clean them, if it is not safe or advisable to delete them, or an ESET product falsely detects them.
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Not all detections found on client devices are moved to quarantine. Detections that are not quarantined include: •Detections that cannot be deleted •Detections that are suspicious based on their behavior, but are not identified as malware, for example, PUAs |
See also the ESET Knowledgebase article about quarantine management.