Is it necessary to download third party Antivirus for iPhone or MacBook Pro

Absolutely not! There is no AntiVirus software that will protect your system more than what Apple has already thought of. In addition any AntiVirus you do install will only conflict with the built in protection already provided with the OS.

No. None can check anything other than its own documents on the iPhone, or is needed on the Mac; if you'd like one on the computer anyway, click here.

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No.

Third parry apps interfere with the Oses own protection.

AppleKlaus wrote:

I wonder if is necessary to get some third part antivirus software to use in my 14 p iPhone or in MacBook Pro.

This article may help: Effective defenses against malware and ot… - Apple Community