Antivirus software is undergoing a major shift. Traditionally, relied on matching files against databases of known malware signatures. But today's threats evolve too quickly for databases of known malware signatures to keep up reliably. It might be helpful to think of it like this: Old antivirus software worked like a nightclub bouncer with a stack of photos of bad actors behind the counter. If a file matched a known malware signature, it got tossed out. If it didn’t, the bad actor...