Do Apple Still Provide Security Updates for Older Macs?

Sunday August 8, 2021. 04:28 PM , from MacMost

Do apple still provide security updates for older macs whose operating systems can’t bee upgraded?
If they don’t,isn’t some form of anti virus required?
I’m trying to decide if a anti virus programme is needed for my old iMac
Device: Mac Running Big Sur
App: Something Else
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John B.

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