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As you surf the Internet, the shields automatically block and quarantine any threats that attempt to download and run on your Mac.
If a shield detects an item that it classifies as a potential threat or an item it does not recognize, it opens an alert. The alert asks if you want to allow the item to run or if you want to block it. If you aren't sure what to do, we recommend blocking the file.
The shields are preconfigured, based on our recommended settings. You do not need to configure any settings yourself unless you are an advanced user and would like to modify shield behavior.