MacScan is a

malware scanner for macOS

. It[SQ]s not a single, universally known product like Norton or McAfee, but rather a general term referring to various software programs and services that scan macOS systems for malicious software and threats. These can range from free, open-source utilities to commercial antivirus applications specifically designed for Macs.

Therefore, to understand what "MacScan" is in a specific context, you[SQ]d need more information. Are you asking about a particular software named MacScan, or are you asking generally about malware scanning for macOS?