Definition - What does Anti-Virus Scanner mean?
An anti-virus scanner may also be known as a virus scanner.
Techopedia explains Anti-Virus Scanner
Anti-virus scanners rely on a virus database that needs to be updated over time. As more viruses and malware programs are created, anti-virus software makers incorporate them into their scanners and programs. Without an updated database, an anti-virus scanner will be much less effective and less likely to successfully quarantine viruses on a drive.