AV is an old term that is really not used much anymore outside of old Windows users.
Malware is a much better term for crap that will do bad things on computers.
Malware Bytes is a product that offers a free and paid version.
https://www.malwarebytes.com. On my Macs I use the free version and run it every day or two.
On my Macs and iPad, iPhone, etc. I also use a paid app
1Blocker from the Apple App Store. It keeps a lot of crap from websites doing things you don't want happening to you and your computer.
1Blocker ONLY works on the Safari Browser.
If you're a security nut like me you might also want to use DNSCrypt to limit who's seeing your DNS requests.