A shared PIN code or a cut key has one big weakness: once it’s out, there’s no way to know who actually used it, and revoking access for one person means changing it for everyone.Modern access control ties entry to an individual — a card credential, a biometric fingerprint or face match, or a mobile-based unlock — so every entry is logged against a specific person, not a shared code. That log is often what turns a security incident from a mystery into a five-minute investigation, since you can see exactly who opened a door and when.It also makes offboarding simple: remove one person’s credential and their access is gone immediately, without touching anyone else’s.