Antivirus software is used to ensure you are protected by numerous threats on the internet such as malware, viruses and identity theft.
Microsoft Defender comes as standard with Windows 10/11 and is automatically enabled so no action is required, you are automatically protected.
Although Apple Macs are less likely to become infected with viruses, there is still a possibility this may occur. Macs can also be vunerable to other threats such as information theft. If you would like to manually scan your mac for malware, you can use free software like Malwarebytes.