Are Security Keys a physical plug for my iMac? I can't figure out
macOS13.6: I was told to read at Mac site about security keys. The page tells me nothing about what a security actually is. It mentions connections like USB-C, Lightning, etc. But why do I need a connection? Is a Security Key a physical device I must buy? Is it two passwords I must keep up w? What the heck is a Security Key, Apple?
iMac 27″, macOS 13.5