When the action on a security risk is "quarantine", the agent renames and then moves the infected file to the quarantine directory on your computer. Actions on security risks are configured by the Trend Micro Security (for Mac) administrator.
Once in the quarantine directory, the agent can perform further action on the quarantined file, depending on the action you choose on the Quarantined Files screen.
Restore: Moves the file back to its original location. Choose this action if you think a file has been incorrectly detected as infected.
Delete: Removes the infected file permanently from the computer.
Clean: Removes the security risk from the file and then moves the file back to its original location.