The good news, is macs have a built in multi-layered defense system against virus and trojan/malevolent software.
Historically and for many years the scarcity of viruses, trojans and other malware that spread widely or affect a broad cross-section of Mac users has contributed to a perceived complacency about good security hygiene.
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This "immune system" consists of sandboxed application design, entitlements to let developers express intent when they need out of the sandbox, signed code to prevent modifications that turn a known app malicious, App Store distribution, system integrity protection, XProtect file quarantine mechanism with a free online update service.
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The simple fact is that malware has always existed for Mac OS (OS X and macOS), so the statement that a Mac can't get malware is patently, demonstrably and dangerously false.Ī second fact is that Apple has done a good job with technology to make the macOS ecosystem largely immune to most threats.